Fix javaPath not looking for .exe (#7590)

I never tested this on windows and finally decided to get to the bottom of all the weird reports ive been getting

core/src/mindustry/Vars.java

@@ -316,7 +316,8 @@ public class Vars implements Loadable{
         logicVars = new GlobalVars();
         javaPath =
             new Fi(OS.prop("java.home")).child("bin/java").exists() ? new Fi(OS.prop("java.home")).child("bin/java").absolutePath() :
-            Core.files.local("jre/bin/java").exists() ? Core.files.local("jre/bin/java").absolutePath() :
+            Core.files.local("jre/bin/java").exists() ? Core.files.local("jre/bin/java").absolutePath() : // Unix
+            Core.files.local("jre/bin/java.exe").exists() ? Core.files.local("jre/bin/java.exe").absolutePath() : // Windows
             "java";
 
         state = new GameState();