Remove fake OCMock group (#23546)

Summary:
We created a fake OCMock group like below which text color is red, actually we have another OCMock group in `RNTesterUnitTests`, so we can remove this.
![image](https://user-images.githubusercontent.com/5061845/53064665-9dcad300-3503-11e9-93c0-fd63b4395ba3.png)

[iOS] [Fixed] - Remove fake OCMock group in RNTester
Pull Request resolved: https://github.com/facebook/react-native/pull/23546

Differential Revision: D14146477

Pulled By: cpojer

fbshipit-source-id: 4878c8d40eab451f20bd7e223d93d212e514f26d

RNTester/RNTester.xcodeproj/project.pbxproj

@@ -882,13 +882,6 @@
 			name = Products;
 			sourceTree = "<group>";
 		};
-		14D6D6EA1B2205C0001FB087 /* OCMock */ = {
-			isa = PBXGroup;
-			children = (
-			);
-			path = OCMock;
-			sourceTree = "<group>";
-		};
 		14D6D7011B220AE3001FB087 /* OCMock */ = {
 			isa = PBXGroup;
 			children = (
@@ -1006,7 +999,6 @@
 				143BC57C1B21E18100462512 /* RNTesterUnitTests */,
 				143BC5961B21E3E100462512 /* RNTesterIntegrationTests */,
 				3D13F83F1D6F6AE000E69E0E /* RNTesterBundle */,
-				14D6D6EA1B2205C0001FB087 /* OCMock */,
 				2DD323911DA2DD8B000FE1B8 /* RNTester-tvOS */,
 				83CBBA001A601CBA00E9B192 /* Products */,
 				2DE7E7D81FB2A4F3009E225D /* Frameworks */,