launcher: prevent early hook from launching in standalone configurator (#678)

## Description of change
Seems to be an oversight when it was initially implemented; hooks should
not load when launching `spicecfg` (or `spice -cfg` or `spice64 -cfg`).

src/spice2x/launcher/launcher.cpp

@@ -1532,6 +1532,7 @@ int main_implementation(int argc, char *argv[]) {
     }
 
     // early hooks
+    if (!cfg_run) {
         for (auto &hook : early_hooks) {
             log_info("launcher", "loading early hook DLL {}", hook);
             libutils::print_dll_info(hook);
@@ -1544,6 +1545,7 @@ int main_implementation(int argc, char *argv[]) {
                     });
             }
         }
+    }
 
     // auto detect game if not specified
     if (avs::game::DLL_NAME.empty()) {