toke.c: Remove the allow_initial_tick hack from S_force_word.

toke.c: Remove the allow_initial_tick hack from S_force_word.

Over the years, every caller which used this hack had it progressively
turned off. Prior to this commit, only one call remained, which
ostensibly handled this case:

format 'STDOUT = ...

However, turns out that even there it was superflous, since a scan_word
a dozen lines before will've already turned all ticks into double
colons.