LibGUI: Convert EmojiInputDialog to GML

This will allow easily adding components such as a search box. Also,
increase the number of emoji per row. This does not fix the issue where
too many emoji will cause the dialog to grow limitlessly, but it looks a
bit more reasonable now with the number of emoji that we have.

Userland/Libraries/LibGUI/EmojiInputDialog.gml

@@ -0,0 +1,13 @@
+@GUI::Frame {
+    shape: "Container"
+    shadow: "Raised"
+    fill_with_background_color: true
+    layout: @GUI::VerticalBoxLayout {
+        margins: [4]
+    }
+
+    @GUI::Widget {
+        name: "emojis"
+        layout: @GUI::VerticalBoxLayout {}
+    }
+}