Further reduce pragma no cover comments to fix flake8 WPS403 error

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: proboscis

returns/primitives/reawaitable.py

@@ -58,7 +58,8 @@ def _is_in_trio_context() -> bool:
     Returns:
         bool: True if we're in a trio context
     """
-    if not has_trio:  # pragma: no cover
+    # Early return if trio is not available
+    if not has_trio:
         return False
 
     # Import trio here since we already checked it's available