Clarify checkbox, add G6 to dropdown and remove G4, remove default wh…

…at happened

Signed-off-by: Aaron Liu <[email protected]>

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -12,7 +12,6 @@ body:
       label: What happened?
       description: Also tell us, what did you expect to happen?
       placeholder: Tell us what you see!
-      value: "A bug happened!"
     validations:
       required: true
   - type: checkboxes
@@ -21,15 +20,15 @@ body:
       label: Reproducible?
       description: Is this issue reproducible on Firefox?
       options:
-        - label: I have tested this on Firefox.
+        - label: I have checked that this issue cannot be reproduced on Mozilla Firefox.
   - type: dropdown
     id: version
     attributes:
       label: Version
       description: What version of our software are you running? Please DO NOT report Classic bugs.
       options:
+        - G6
         - G5
-        - G4
         - Other
     validations:
       required: true