MDL-52964 Qtype: Small fixes to behat tests

This applies some small changes to proposed behat tests:

- Geting rid of the @javascript tag when it's not needed.
- Adding some missing @_switch_window tags.
- Fixing some scenario names, previously duplicated.
- Fixing some typos and whitespace.

question/type/truefalse/tests/behat/add.feature

@@ -18,7 +18,6 @@ Feature: Test creating a True/False question
     And I follow "Course 1"
     And I navigate to "Question bank" node in "Course administration"
 
-  @javascript
   Scenario: Create a True/False question with Correct answer as False
     When I add a "True/False" question filling the form with:
       | Question name                      | true-false-001                             |
@@ -29,8 +28,7 @@ Feature: Test creating a True/False question
       | Feedback for the response 'True'.  | Well done!                                 |
       | Feedback for the response 'False'. | Read more about England.                   |
       Then I should see "true-false-001"
- 
-  @javascript
+
   Scenario: Create a True/False question with Correct answer as True
     When I add a "True/False" question filling the form with:
       | Question name                      | true-false-002                         |

question/type/truefalse/tests/behat/edit.feature

@@ -24,7 +24,6 @@ Feature: Test editing a True/False question
     And I follow "Course 1"
     And I navigate to "Question bank" node in "Course administration"
 
-  @javascript
   Scenario: Edit a True/False question
     When I click on "Edit" "link" in the "true-false-001" "table_row"
     And I set the following fields to these values:

question/type/truefalse/tests/behat/export.feature

@@ -23,7 +23,6 @@ Feature: Test exporting True/False questions
     And I log in as "teacher1"
     And I follow "Course 1"
 
-  @javascript
   Scenario: Export a True/False question
     When I navigate to "Export" node in "Course administration > Question bank"
     And I set the field "id_format_xml" to "1"

question/type/truefalse/tests/behat/preview.feature

@@ -24,8 +24,8 @@ Feature: Preview a Trtue/False question
     And I follow "Course 1"
     And I navigate to "Question bank" node in "Course administration"
 
-  @javascript
-  Scenario: Preview a question and submit a correct response.
+  @javascript @_switch_window
+  Scenario: Preview a True/False question and submit a correct response.
     When I click on "Preview" "link" in the "true-false-001" "table_row"
     And I switch to "questionpreview" window
     And I set the field "How questions behave" to "Immediate feedback"
@@ -36,8 +36,8 @@ Feature: Preview a Trtue/False question
     And I should see "The correct answer is 'True'."
     And I switch to the main window
 
-  @javascript
-  Scenario: Preview a question and submit an incorrect response.
+  @javascript @_switch_window
+  Scenario: Preview a True/False question and submit an incorrect response.
     When I click on "Preview" "link" in the "true-false-001" "table_row"
     And I switch to "questionpreview" window
     And I set the field "How questions behave" to "Immediate feedback"