Remove duplicate -renderer option

Guess this was here from when Leo added command-line playtesting.

desktop_version/src/main.cpp

@@ -103,9 +103,6 @@ int main(int argc, char *argv[])
                 return 1;
             }
         }
-        if (std::string(argv[i]) == "-renderer") {
-            SDL_SetHintWithPriority(SDL_HINT_RENDER_DRIVER, argv[2], SDL_HINT_OVERRIDE);
-        }
     }
 
     SDL_SetHintWithPriority(SDL_HINT_RENDER_VSYNC, "1", SDL_HINT_OVERRIDE);