fix(GUI): display zip in supported images tooltip (#539)

The `SupportedFormatsModel` went through some changes recently, notably,
the distinction between compressed and archived formats.

This change introduced a subtle issue since we listed compressed and non
compressed supported formats on the main screen, but forgot about
archives.

Changelog-Entry: Display `*.zip` in the supported images tooltip.
Change-Type: patch
Signed-off-by: Juan Cruz Viotti <jviottidc@gmail.com>

lib/gui/partials/main.html

@@ -10,7 +10,8 @@
           <button class="btn btn-primary btn-brick" ng-click="app.openImageSelector()">Select image</button>
 
           <p class="step-footer">
-            {{ ::app.formats.getNonCompressedExtensions().join(', ') }}, or
+            {{ ::app.formats.getNonCompressedExtensions().join(', ') }},
+            {{ ::app.formats.getArchiveExtensions().join(', ') }}, or
             <span class="step-footer-underline"
               uib-tooltip="{{ app.formats.getCompressedExtensions().join(', ') }}">compressed images</span>
           </p>