enhance issue template formatting

remove additional lines in issue template to improve rendering of issues
filled out using template

Signed-off-by: Ben Bodenmiller <[email protected]>

Author: bbodenmiller

.github/ISSUE_TEMPLATE.md

@@ -1,6 +1,4 @@
- - [ ] I was not able to find an [open](https://github.com/git-for-windows/git/issues?q=is%3Aopen)
-   or [closed](https://github.com/git-for-windows/git/issues?q=is%3Aclosed) issue
-   matching what I'm seeing
+ - [ ] I was not able to find an [open](https://github.com/git-for-windows/git/issues?q=is%3Aopen) or [closed](https://github.com/git-for-windows/git/issues?q=is%3Aclosed) issue matching what I'm seeing
 
 ### Setup