style: apply ktlint and dart format fixes

- ktlint formatted BackgroundWorkerTest.kt
- dart format fixed workmanager_test.dart formatting

These should have been run before the initial commits.

Author: ened

workmanager/test/workmanager_test.dart

@@ -53,7 +53,7 @@ void main() {
     test("WorkmanagerFlutterApi implementation handles null safely", () {
       // This test verifies that the fix for null cast to map bug exists
       // The fix safely handles null keys and values in inputData parameter
-      // 
+      //
       // Original issue: inputData?.cast<String, dynamic>() would fail when
       // the map contained null keys or when cast failed
       //

workmanager_android/android/src/test/kotlin/dev/fluttercommunity/workmanager/BackgroundWorkerTest.kt

@@ -6,7 +6,7 @@ class BackgroundWorkerTest {
     @Test
     fun `verify null callback handling exists in BackgroundWorker`() {
         // This test verifies that the null check for callbackInfo exists in BackgroundWorker.kt
-        // 
+        //
         // The fix adds this check:
         // if (callbackInfo == null) {
         //     Log.e(TAG, "Failed to resolve Dart callback for handle $callbackHandle.")
@@ -18,7 +18,7 @@ class BackgroundWorkerTest {
         // returns null due to invalid or stale callback handles.
         //
         // The fix resolves crashes reported in issues #624, #621, #527
-        
+
         // Test passes if compilation succeeds, proving the null check is in place
         assert(true)
     }