Take branding for vfs plugins into account

Signed-off-by: Felix Weilbach <felix.weilbach@nextcloud.com>

admin/linux/build-appimage.sh

@@ -57,8 +57,9 @@ cd /app
 mv usr/lib/x86_64-linux-gnu/* usr/lib/
 
 mkdir usr/plugins
-mv usr/lib/nextcloudsync_vfs_suffix.so usr/plugins
-mv usr/lib/nextcloudsync_vfs_xattr.so usr/plugins
+mv usr/lib/${APPNAME}sync_vfs_suffix.so usr/plugins
+mv usr/lib/${APPNAME}sync_vfs_xattr.so usr/plugins
+
 
 rm -rf usr/lib/cmake
 rm -rf usr/include