Update bug_report.md (remove checkboxes) (#4426)

- they are represented as tasks
- users don't check them

.github/ISSUE_TEMPLATE/bug_report.md

@@ -18,11 +18,11 @@ A clear and concise description of what the bug is.
 
 **Affected platforms**
 <!-- Select one or multiple affected platforms below: -->
-- [ ] Desktop (Windows, Linux, macOS)
+- Desktop (Windows, Linux, macOS)
-- [ ] iOS
+- iOS
-- [ ] Web (K/Wasm) - Canvas based API
+- Web (K/Wasm) - Canvas based API
-- [ ] Web (K/JS) - Canvas based API
+- Web (K/JS) - Canvas based API
-- [ ] Web (K/JS) - HTML library
+- Web (K/JS) - HTML library
 
 **Versions**
 - Kotlin version*: