[packages] transmission: update to 2.80

git-svn-id: svn://svn.openwrt.org/openwrt@37044 3c298f89-4303-0410-b956-a3cf2f4a3e73
[packages] transmission: update to 2.80, fix version number

git-svn-id: svn://svn.openwrt.org/openwrt@37045 3c298f89-4303-0410-b956-a3cf2f4a3e73