ArgsToStrings misses delimiter with one-character args

[ajaspers]

MONITOR + a,b,c
:oragono.test 731 hi a,b,c
MONITOR L
:oragono.test 732 hi ab,c
:oragono.test 733 hi :End of MONITOR list
MONITOR S
:oragono.test 731 hi ab,c

[DanielOaks]

ooh, iiiinteresting. thanks for the report and the PR, much appreciated! <3