Restore err.c and err.cpp to unformatted state

The test files were accidentally formatted, causing tests to pass
when they should fail. Restored them to match test_file_strs.

Author: pocc

tests/test_repo/err.c

@@ -1,5 +1,2 @@
 #include <stdio.h>
-int main() {
-  int i;
-  return;
-}
+int main(){int i;return;}

tests/test_repo/err.cpp

@@ -1,5 +1,2 @@
 #include <string>
-int main() {
-  int i;
-  return;
-}
+int main(){int i;return;}