Fix /dll command

[Vasily]

I pasted the files in to some directory in my mIRC dir, so the /dll
command doesn't work.
You can fix this by replacing the "dll LarrysmIRCIndexer.dll" lines
with "dll $+($scriptdir,LarrysmIRCIndexer.dll)".
Thanks.

[Larry Gadea]

Hey.

Thanks for the feedback. I will implement that in the next release of
the plugin.

-- Larry Gadea