7240 5.2x: fix image name

git-svn-id: file:///var/svn/freetz/trunk@10262 149334a1-2f27-0410-a3b9-fc62619ac1e6
firmware bump: 7320 & 7312 5.50
 * as always: if you need the sources for "replace kernel" write an email to {{{fritzbox_info at avm.de}}}

git-svn-id: file:///var/svn/freetz/trunk@10263 149334a1-2f27-0410-a3b9-fc62619ac1e6