use auto instead of on

Author: codeanticode

src/processing/mode/android/EmulatorController.java

@@ -90,7 +90,9 @@ synchronized public void launch(File sdkToolsPath, boolean wear, boolean gpu) th
       avdName = AVD.mobileAVD.name;
     }
 
-    String gpuFlag = gpu ? "on" : "off";
+    // https://developer.android.com/studio/run/emulator-acceleration.html#accel-graphics
+    String gpuFlag = gpu ? "auto" : "off";
+    
     File emulatorPath = new File(sdkToolsPath, "emulator");
     if(!emulatorPath.exists())
       emulatorPath = new File(sdkToolsPath, "emulator.exe"); //Windows