gcs: fix id of quad-x image in SVG

The quad-x image was missing in the GCS config gadget.

GCS expects the quad-x image to have id=quad-X (upper
case X).

ground/openpilotgcs/src/plugins/config/images/quad-shapes.svg

@@ -3668,7 +3668,7 @@
        id="g6963" /><g
        id="g6995" /><g
        id="g7027" /><g
-       id="quad-x"><g
+       id="quad-X"><g
          transform="matrix(1,0,0,-1,0,2792.2535)"
          id="g5011"><path
            d="m 1001.67,1438.583 2.695,0 0,-16.728 16.729,0 0,16.728 2.988,0 -11.205,11.205 -11.207,-11.205 z"
@@ -6800,4 +6800,4 @@
          d="m 234.6162,1496.2944 0,10.918 -2.771,-2.142 -1.828,2.499 4.892,3.59 3.234,0 0,-14.865 -3.527,0 z"
          style="fill:#ffffff;fill-opacity:1;fill-rule:nonzero;stroke:none"
          id="path10359"
-         inkscape:connector-curvature="0" /></g></g></svg>
+         inkscape:connector-curvature="0" /></g></g></svg>