Update new files

templates/test/core/surface/public_headers_must_be_c89.c.template

@@ -54,6 +54,4 @@
   #include <${hdr}>
   % endfor
 
-  int main(int argc, char **argv) {
-    return 0;
-  }
+  int main(int argc, char **argv) { return 0; }

test/core/surface/public_headers_must_be_c89.c

@@ -58,6 +58,4 @@
 #include <grpc/support/tls.h>
 #include <grpc/support/useful.h>
 
-int main(int argc, char **argv) {
-  return 0;
-}
+int main(int argc, char **argv) { return 0; }