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/match/tests/behat/add.feature

@@ -18,7 +18,6 @@ Feature: Test creating a Matching question
     And I follow "Course 1"
     And I navigate to "Question bank" node in "Course administration"
 
-  @javascript
   Scenario: Create a Matching question with 3 subquestions
     When I add a "Matching" question filling the form with:
       | Question name                      | match-001                                      |

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

@@ -24,7 +24,7 @@ Feature: Test editing a Matching question
     And I follow "Course 1"
     And I navigate to "Question bank" node in "Course administration"
 
-  @javascript
+  @javascript @_switch_window
   Scenario: Edit a Matching question
     When I click on "Edit" "link" in the "Matching for editing" "table_row"
     And I set the following fields to these values:

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

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

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

@@ -24,8 +24,8 @@ Feature: Preview a Matching 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 Matching question and submit a correct response.
     When I click on "Edit" "link" in the "matching-001" "table_row"
     And I set the following fields to these values:
       | Shuffle    | 0   |
@@ -42,8 +42,8 @@ Feature: Preview a Matching question
     And I should see "General feedback."
     And I switch to the main window
 
-  @javascript
-  Scenario: Preview a question and submit a partially correct response.
+  @javascript @_switch_window
+  Scenario: Preview a Matching question and submit a partially correct response.
     When I click on "Edit" "link" in the "matching-001" "table_row"
     And I set the following fields to these values:
       | Shuffle    | 0   |
@@ -60,8 +60,8 @@ Feature: Preview a Matching question
     And I should see "General feedback."
     And I switch to the main window
 
-  @javascript
-  Scenario: Preview a question and submit an incorrect response.
+  @javascript @_switch_window
+  Scenario: Preview a Matching question and submit an incorrect response.
     When I click on "Edit" "link" in the "matching-001" "table_row"
     And I set the following fields to these values:
       | Shuffle    | 0   |