editor: Reset text model on reset
editor: Reset text model on reset

There were some reset calls missing, which resulted in wrong preedit
state on input method side.

Signed-off-by: Jan Arne Petersen <8c3575d1e692bfe9fd3220cb3956503cdd270f15@openismus.com>

kwm81/weston,Tarnyko/weston-xdg_surface_present,sir-murray/weston,Fantu/compositor-spice,xorgy/weston,giucam/weston,krezovic/weston,Fantu/compositor-spice,Tarnyko/weston-xdg_surface_present,jonnylamb/weston,jonnylamb/weston,Fantu/compositor-spice,Gnurou/weston,udoprog/weston,sir-murray/weston,Gnurou/weston,krezovic/weston,giucam/weston,eyolfson/weston,xorgy/weston,mchalupa/weston,udoprog/weston,mchalupa/weston,kwm81/weston,eyolfson/weston