Fix condition in editor icons filtering logic

Fixes #27595.

(cherry picked from commit 5062b4a26b70701cf3f687d726ac78634b20d6d8)

editor/editor_themes.cpp

@@ -204,7 +204,7 @@ void editor_register_and_generate_icons(Ref<Theme> p_theme, bool p_dark_theme =
 		}
 
 	// generate thumb files with the given thumb size
-	bool force_filter = !(p_thumb_size == 64 && p_thumb_size == 32); // we don't need filter with original resolution
+	bool force_filter = p_thumb_size != 64 && p_thumb_size != 32; // we don't need filter with original resolution
 	if (p_thumb_size >= 64) {
 		float scale = (float)p_thumb_size / 64.0 * EDSCALE;
 		for (int i = 0; i < editor_bg_thumbs_count; i++) {