Fix typo in issue template header

Corrected the header from 'Isse' to 'Issue' for clarity.

Author: rofl0r

.github/ISSUE_TEMPLATE/new-issue--bug-report--question.md

@@ -13,7 +13,7 @@ Windows/Mac/Linux. in case of linux, whether you use CLI, gtk2, or gtk3 version.
 ## DesMuME version
 e.g. 0.9.13 or git master
 
-## Isse
+## Issue
 type here what's bothering you, in a detailed manner.