Remove a stray tab that snuck into a test. No functionality change

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@202739 91177308-0d34-0410-b5e6-96231b3b80d8

test/iterators/predef.iterators/reverse.iterators/reverse.iter.ops/reverse.iter.make/make_reverse_iterator.pass.cpp

@@ -35,7 +35,7 @@ int main()
     random_access_iterator<const char*>b(s);
     random_access_iterator<const char*>e(s+10);
     while ( b != e )
-    	test ( b++ );
+        test ( b++ );
 }
 #else
 int main () {}