[#2] Changed legacy parameter to match the implementation of OpenSRProject/OpenStarRuler#11.

Author: DaloLorn

src/main/java/io/github/openstarruler/launchpad/view/MainController.kt

@@ -185,7 +185,7 @@ class MainController {
             .showAndWait()
         val params = mutableListOf(launcher.absolutePath)
         if(runLegacy)
-            params.add("--useLegacyBinaries")
+            params.add("--legacy")
         try {
             ProcessBuilder(params)
                 .directory(launcher.parentFile)