fix: remove not available view helper

packages/base/ContentBlocks/ContentElements/imagegallery/templates/backend-preview.html

@@ -23,9 +23,6 @@
                 </f:if>
             </f:for>
         </div>
-        <f:if condition="{data.image -> f:count()} > 3">
-            <p>+ {f:math.subtract(a: '{data.image -> f:count()}', b: '3')} more images</p>
-        </f:if>
         <p>
             <f:switch expression="{data.columns}">
                 <f:case value="2">2 Columns</f:case>