Change color format to use #HEX notation

Updated color format in paint issue template.

Author: Pranav-MSK

.github/ISSUE_TEMPLATE/paint.yml

@@ -12,7 +12,7 @@ body:
         Use the correct format below.
 
         **Format:**
-        Paint [A5] #FF5733
+        Paint [A5] #HEX
 
         ---
         Valid: