eowyn.sh: remove checking formatting one file at a time

This avoids unnecessary output.
Also remove the comment, since the message to stdout makes it
unnecessary.

patches/eowyn.sh

@@ -45,13 +45,8 @@ do
     fi
 done
 
-# Test the correct formatting of the healed exercises.
 echo "Looking for non-conforming code formatting..."
-for healed in patches/healed/*.zig
-do
-	echo Check $(basename "$healed")
-	zig fmt --check "$healed"
-done
+zig fmt --check patches/healed
 
 # Test the healed exercises. May the compiler have mercy upon us.
 zig build -Dhealed