Backout mock l10n mozconfig changes for fx/tb esr17 + tb release, because we backed mock out. r=jhopkins

--HG--
extra : transplant_source : 7W%B9vx%92%25%11%1C%27%18%B4U%D0%A21%97%CF%1DP
Set relbranches for Fx/Tb 17.0.2esr release respins. r=jhopkins

--HG--
extra : transplant_source : q7%D2%05%95%A9s%B8GGoZ%CB%98%BC%0E%7B%FF%87%A5