Autodetect Java?

Signed-off-by: Trial97 <alexandru.tripon97@gmail.com>

launcher/java/JavaRuntime.cpp

@@ -1,3 +1,21 @@
+// SPDX-License-Identifier: GPL-3.0-only
+/*
+ *  Prism Launcher - Minecraft Launcher
+ *  Copyright (c) 2023 Trial97 <alexandru.tripon97@gmail.com>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 #include "java/JavaRuntime.h"
 
 #include <memory>
@@ -23,6 +41,7 @@ QString downloadTypeToString(DownloadType javaDownload)
         case DownloadType::Archive:
             return "archive";
     }
+    return "";
 }
 MetaPtr parseJavaMeta(const QJsonObject& in)
 {