Change back branches (paritytech#1624)

* Change back sv-locked-for-gav-xcm-v3-and-bridges-3 -> sv-locked-for-gav-xcm-v3-and-bridges

* Change back locked-for-gav-xcm-v3-and-bridges-3 -> locked-for-gav-xcm-v3-and-bridges

* Changed cumulus branch: gav-xcm-v3 -> cumulus-locked-for-gav-xcm-v3-and-bridges

Author: bkontur