minor format fix

Author: diwu-arete

firebase-segmentation/src/androidTest/java/com/google/firebase/segmentation/FirebaseSegmentationInstrumentedTest.java

@@ -69,9 +69,7 @@ public void setUp() {
     firebaseApp =
         FirebaseApp.initializeApp(
             ApplicationProvider.getApplicationContext(),
-            new FirebaseOptions.Builder()
-                .setApplicationId("1" + ":123456789:android:abcdef")
-                .build());
+            new FirebaseOptions.Builder().setApplicationId("1:123456789:android:abcdef").build());
     actualCache = new CustomInstallationIdCache(firebaseApp);
 
     when(backendClientReturnsOk.updateCustomInstallationId(

firebase-segmentation/src/main/java/com/google/firebase/segmentation/FirebaseSegmentation.java

@@ -75,7 +75,7 @@ public static FirebaseSegmentation getInstance() {
    */
   @NonNull
   public static FirebaseSegmentation getInstance(@NonNull FirebaseApp app) {
-    Preconditions.checkArgument(app != null, "Null is not a valid value " + "of FirebaseApp.");
+    Preconditions.checkArgument(app != null, "Null is not a valid value of FirebaseApp.");
     return app.get(FirebaseSegmentation.class);
   }