Unlock root group homepage template to allow for editing (Bug #1369315)

Due to the line 1868 in lib/db/upgrade.php
commit 1e4f1c55cc032dd4dea6ed7467746edfffa4e7d5

All group homepages were locked including the one owned by root user.
That was fine before as one couldn't edit the root user's template
but now you can so we need to let this view be unlocked.

Only an issue if upgrading from version before 1.5.0

Change-Id: I02c28c0300ad9d640171c5870fa8630b0793e473
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>