fix overlay crash

Author: brachy84

src/main/java/com/cleanroommc/modularui/screen/ModularScreen.java

@@ -685,7 +685,7 @@ private static Class<?> getGuiActionClass(IGuiAction action) {
 
     public ITheme getCurrentTheme() {
         if (this.currentTheme == null) {
-            useTheme(this.context.getUISettings().getTheme());
+            useTheme(null);
         }
         return this.currentTheme;
     }

src/main/java/com/cleanroommc/modularui/screen/viewport/ModularGuiContext.java

@@ -479,6 +479,9 @@ public void setSettings(UISettings settings) {
             throw new IllegalStateException("Tried to set settings twice");
         }
         this.settings = settings;
+        if (this.settings.getTheme() != null) {
+            this.screen.useTheme(this.settings.getTheme());
+        }
     }
 
     private static class HoveredIterable implements Iterable<IGuiElement> {

src/main/java/com/cleanroommc/modularui/test/OverlayTest.java

@@ -31,6 +31,7 @@ public static void init() {
             AtomicInteger k = new AtomicInteger();
             return new ModularScreen(ModularPanel.defaultPanel("overlay").sizeRel(1f)
                     .background(IDrawable.EMPTY)
+                    .disableHoverBackground()
                     .child(title.scale(5f)
                             .shadow(true)
                             .color(colors[k.get()])