chore(template): remove placeholder in relevant-files

- For some reason, I can't insert a file when I use the `placeholder` key.(This is a beta feature and may change in time.)

.github/ISSUE_TEMPLATE/bug-report.yaml

@@ -35,12 +35,7 @@ body:
 
         Keep in mind that users are not in a position to decide which files will contribute to debugging the problem, unless they are familiar with the source code and behavior. When in doubt, include as many relevant files as possible.
       render: Shell
-      placeholder: |
-        Engine.log.zip (Highly recommended)
-
-        or
-
-        The log messages
+      # NOTE: The `placeholder` key is not used here because for some reason it prevents the file from being inserted.
     validations:
       required: true