kunit: fix display of failed expectations for strings

Currently the following expectation
  KUNIT_EXPECT_STREQ(test, "hi", "bye");
will produce:
  Expected "hi" == "bye", but
      "hi" == 1625079497
      "bye" == 1625079500

After this patch:
  Expected "hi" == "bye", but
      "hi" == hi
      "bye" == bye

KUNIT_INIT_BINARY_STR_ASSERT_STRUCT() was written but just mistakenly
not actually used by KUNIT_EXPECT_STREQ() and friends.
Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Tested-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

include/kunit/test.h

@@ -1105,7 +1105,7 @@ do {									       \
 	KUNIT_ASSERTION(test,						       \
 			strcmp(__left, __right) op 0,			       \
 			kunit_binary_str_assert,			       \
-			KUNIT_INIT_BINARY_ASSERT_STRUCT(test,		       \
+			KUNIT_INIT_BINARY_STR_ASSERT_STRUCT(test,	       \
 							assert_type,	       \
 							#op,		       \
 							#left,		       \