refactor spacemacs-buffer/goto-buffer: fix logic flaw, center in terminal
refactor spacemacs-buffer/goto-buffer: fix logic flaw, center in terminal

fix buffer not re-created when buffer does not exist and last-width did
not change.

allow for home buffer centering in terminals.

tsonntag/dotemacs,tsonntag/dotemacs,tsonntag/dotemacs,tsonntag/dotemacs