1.2-dev page shadow option in welcome dialog does nothing.

Steps to reproduce:

• open Inkscape
• Select a canvas option in the Welcome dialog
• Go through the dialog to open a new page

What happened?

• shadow is still present

What should have happened?

• shadow should be hidden when the canvas option has shadow disabled, see the welcome dialog's glade file (all the options have shadow set to false)
  • I have always preferred shadows, so I'm not the best judge on whether we should change these options.

 <object class="GtkListStore" id="canvases">
    <columns>
      <!-- column-name id -->
      <column type="gchararray"/>
      <!-- column-name name -->
      <column type="gchararray"/>
      <!-- column-name preview -->
      <column type="GdkPixbuf"/>
      <!-- column-name pagecolor -->
      <column type="gchararray"/>
      <!-- column-name checkered -->
      <column type="gboolean"/>
      <!-- column-name border -->
      <column type="gchararray"/>
      <!-- column-name shadow -->
      <column type="gboolean"/>
    </columns>
    <data>
      <row>
        <col id="0">light</col>
        <col id="1" translatable="yes">Default</col>
        <col id="2">resources/canvas_aw.png</col>
        <col id="3">rgba(255, 255, 255, 0)</col>
        <col id="4">False</col>
        <col id="5">#999999</col>
        <col id="6">False</col>
      </row>

Version info

• Inkscape 1.2-dev (6bee14a5a3, 2022-01-29) Linux Mint 20
• Introduced in c2cb8da53ee2cf5cbe19d393b0618a5a186ee82c