[ui] add icon view icon for the symbol list widget

images/images.qrc

@@ -179,6 +179,7 @@
         <file>themes/default/mActionAddBasicCircle.svg</file>
         <file>themes/default/mActionEditNodesItem.svg</file>
         <file>themes/default/mActionEditHelpContent.svg</file>
+        <file>themes/default/mActionIconView.svg</file>
         <file>themes/default/mActionIncreaseFont.svg</file>
         <file>themes/default/mActionInterfaceCustomization.svg</file>
         <file>themes/default/mActionDecreaseFont.svg</file>

images/themes/default/mActionIconView.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="24" width="24"><path d="M2.5 2.5h19v19h-19z" fill="#e6e6e6" stroke="#6e97c4"/><path style="line-height:normal;font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-feature-settings:normal;text-indent:0;text-align:start;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000;text-transform:none;text-orientation:mixed;shape-padding:0;isolation:auto;mix-blend-mode:normal" d="M4 4v4h4V4zM10 4v4h4V4zM16 4v4h4V4zM4 10v4h4v-4zM10 10v4h4v-4zM16 10v4h4v-4zM4 16v4h4v-4zM10 16v4h4v-4zM16 16v4h4v-4z" color="#000" font-weight="400" font-family="sans-serif" white-space="normal" overflow="visible" fill="#6e97c4"/></svg>

src/ui/symbollayer/widget_symbolslist.ui

@@ -187,7 +187,7 @@
          </property>
          <property name="icon">
           <iconset resource="../../../images/images.qrc">
-           <normaloff>:/images/themes/default/mActionFilterTableFields.svg</normaloff>:/images/themes/default/mActionFilterTableFields.svg</iconset>
+           <normaloff>:/images/themes/default/mActionIconView.svg</normaloff>:/images/themes/default/mActionIconView.svg</iconset>
          </property>
          <property name="checkable">
           <bool>true</bool>