Fix the formatting to use tabs instead of spaces, easier to read this way.

tmux-mem-cpu-load.cpp

@@ -170,6 +170,7 @@ int main(int argc, char** argv)
 			iss >> status_interval;
 			cpu_usage_delay = status_interval * 1000000 - 100000;
 		}
+
 		if( argc > 2 )
 		{
 			iss.str( argv[2] );