Layout Editor: Fix invisible bottom part of the screen (#3033)

In non full-screen mode, the bottom of the screen was hidden behind the
bottom toolbar. This includes the "Add Masonry" button and any
components at the bottom of the screen.

Also-by: Florian Hotze <dev@florianhotze.com>
Signed-off-by: Jimmy Tanagra <jcode@tanagra.id.au>

bundles/org.openhab.ui/web/src/components/widgets/layout/oh-layout-page.vue

@@ -29,6 +29,7 @@
           </f7-list>
         </f7-block>
       </template>
+      <div v-if="context.editmode && !$fullscreen.isFullscreen" style="height: calc(var(--f7-toolbar-height) + var(--f7-safe-area-bottom) + 40px)" />
     </template>
     <template v-else-if="config.layoutType === 'fixed' && (!config.fixedType || config.fixedType === 'grid')">
       <oh-grid-layout :context="context" />