Update show orientation axes icon to SVG

Missed this in the last round.

Qt/ApplicationComponents/Resources/UI/pqAxesToolbar.ui

@@ -26,7 +26,7 @@
     <bool>false</bool>
    </property>
    <property name="icon" >
-    <iconset resource="../pqComponents.qrc">:/pqWidgets/Icons/pqShowOrientationAxes.png</iconset>
+    <iconset resource="../pqComponents.qrc">:/pqWidgets/Icons/pqShowOrientationAxes.svg</iconset>
    </property>
    <property name="text" >
     <string>Show Orientation Axes</string>

Qt/Components/Resources/pqComponents.qrc

@@ -159,8 +159,7 @@
         <file>Icons/pqSettings.svg</file>
         <file>Icons/pqShadow24.png</file>
         <file>Icons/pqShowCenterAxes.svg</file>
-        <file>Icons/pqShowOrientationAxes.png</file>
-        <file>Icons/pqShowOrientationAxes@2x.png</file>
+        <file>Icons/pqShowOrientationAxes.svg</file>
         <file>Icons/pqSideSetData.svg</file>
         <file>Icons/pqSinusoidal24.png</file>
         <file>Icons/pqSlice.svg</file>