Remove community repository from Arch images

Community repository is no longer needed for the test image. OBS does
not pull any package from this repository and in Arch linux there is not
the concept of empty repositories, so the build fails in an OBS context
if this repository is included within the build stack.

Signed-off-by: David Cassany <[email protected]>

build-tests/x86/archlinux/test-image-live-disk-kis/appliance.kiwi

@@ -68,9 +68,6 @@
     <repository components="Virtualization_Appliances_Images_Testing_x86_archlinux_standard">
         <source path="obs://Virtualization:Appliances:Images:Testing_x86:archlinux/standard"/>
     </repository>
-    <repository components="Arch_Community_standard">
-        <source path="obs://Arch:Community/standard"/>
-    </repository>
     <repository components="Arch_Extra_standard">
         <source path="obs://Arch:Extra/standard"/>
     </repository>