FIX: Fixes for CI warnings (#1787)

Author: ritamerkl

Packages/com.unity.inputsystem/InputSystem/Editor/UITKAssetEditor/Resources/InputActionsEditorStyles.uss

@@ -80,6 +80,13 @@
     padding-bottom: 7px;
 }
 
+.tree-view-item-icon{
+    justify-content: center;
+    background-image: url("/Packages/com.unity.inputsystem/InputSystem/Editor/Icons/d_InputControl.png");
+    width: 16px;
+    height: 16px;
+}
+
 .header {
     height: 22px;
     flex-direction: row;

Packages/com.unity.inputsystem/InputSystem/Editor/UITKAssetEditor/Resources/InputActionsTreeViewItem.uxml

@@ -2,7 +2,7 @@
     <Style src="project://database/Packages/com.unity.inputsystem/InputSystem/Editor/UITKAssetEditor/Resources/InputActionsEditorStyles.uss?fileID=7433441132597879392&amp;guid=7dac9c49a90bca4499371d0adc9b617b&amp;type=3#InputActionsEditorStyles" />
     <ui:VisualElement name="item-row" class="unity-list-view__item" style="flex-direction: row; flex-grow: 1; justify-content: space-between; margin-left: 4px; flex-shrink: 0;">
         <ui:VisualElement name="row" style="flex-direction: row; border-left-width: 0; border-left-color: rgb(89, 89, 89); justify-content: flex-start; align-items: center;">
-            <ui:VisualElement name="icon" style="justify-content: center; background-image: url(&apos;project://database/Packages/com.unity.inputsystem/InputSystem/Editor/Icons/d_InputControl.png?fileID=2800000&amp;guid=399cd90f4e31041e692a7d3a8b1aa4d0&amp;type=3#d_InputControl&apos;); width: 16px; height: 16px;" />
+            <ui:VisualElement name="icon" class="tree-view-item-icon"/>
             <ui:TextField picking-mode="Ignore" name="rename-text-field" is-delayed="true" focusable="true" class="unity-input-actions-editor-hidden" style="visibility: visible; flex-shrink: 1;" />
             <ui:Label text="binding-name" display-tooltip-when-elided="true" name="name" style="flex-grow: 1; justify-content: center; align-items: stretch; margin-left: 4px; -unity-font-style: normal;" />
         </ui:VisualElement>