Use the new scrcpy icon

Use the new icon designed by @varlesh:
<https://github.com/Genymobile/scrcpy/pull/1987#issuecomment-949684080>

Attempt to use the SVG, and fallback to PNG.

run

@@ -20,4 +20,6 @@ then
     exit 1
 fi
 
-SCRCPY_SERVER_PATH="$BUILDDIR/server/scrcpy-server" "$BUILDDIR/app/scrcpy" "$@"
+SCRCPY_ICON_PATH="data/icon.svg" \
+SCRCPY_SERVER_PATH="$BUILDDIR/server/scrcpy-server" \
+"$BUILDDIR/app/scrcpy" "$@"