enable iPad support for obj-c sample project

Author: yramanchuk

samples/objc/FirebaseUI-demo-objc.xcodeproj/project.pbxproj

@@ -490,6 +490,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "com.google.firebase.FirebaseUI-demo-objc";
 				PRODUCT_NAME = "$(TARGET_NAME)";
+				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
 		};
@@ -502,6 +503,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "com.google.firebase.FirebaseUI-demo-objc";
 				PRODUCT_NAME = "$(TARGET_NAME)";
+				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
 		};