PixelPaint: Change the default layer name to "Layer"

Change the default layer name to "Layer" and enable the user to press
return to quickly close the dialog.

Userland/Applications/PixelPaint/CreateNewLayerDialog.cpp

@@ -30,6 +30,8 @@ CreateNewLayerDialog::CreateNewLayerDialog(Gfx::IntSize const& suggested_size, G
     name_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
 
     m_name_textbox = main_widget.add<GUI::TextBox>();
+    m_name_textbox->set_text("Layer");
+    m_name_textbox->select_all();
     m_name_textbox->on_change = [this] {
         m_layer_name = m_name_textbox->text();
     };
@@ -65,6 +67,10 @@ CreateNewLayerDialog::CreateNewLayerDialog(Gfx::IntSize const& suggested_size, G
         m_layer_size.set_height(value);
     };
 
+    m_name_textbox->on_return_pressed = [this] {
+        done(ExecOK);
+    };
+
     width_spinbox.set_range(1, 16384);
     height_spinbox.set_range(1, 16384);