issue template maintenance

Change-Id: I50b5ee6f6046bd4cacccbf4d17d1334b11959419
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/419740
Auto-Submit: Devon Carew <[email protected]>
Reviewed-by: Kevin Moore <[email protected]>
Commit-Queue: Kevin Moore <[email protected]>

Author: devoncarew

.github/ISSUE_TEMPLATE/2_analyzer.md renamed to .github/ISSUE_TEMPLATE/2_devexp.md

@@ -38,4 +38,3 @@ body:
     attributes:
       value: |
         Thank you for helping improve hot reload on the web!
-