refactor: change private method playButtonSound to protected so that it can be used by classes extending MachineScreen

Author: Roelymole

src/main/java/dev/galacticraft/machinelib/client/api/screen/MachineScreen.java

@@ -911,7 +911,7 @@ protected void renderTooltip(GuiGraphics graphics, int mouseX, int mouseY) {
     /**
      * Plays a button click sound.
      */
-    private void playButtonSound() {
+    protected void playButtonSound() {
         assert this.minecraft != null;
         this.minecraft.getSoundManager().play(SimpleSoundInstance.forUI(SoundEvents.UI_BUTTON_CLICK, 1.0F));
     }