[NCM] Fix incorrect keyword used for completion

My previous calculation was incorrect for lines with multiple keywords.
NCM has already performed the regex calculation & saved me time, so
there is no need for me to repeat it.

This is both a performance boost & bug fix

Author: SevereOverfl0w

pythonx/cm_sources/fireplace.py

@@ -22,5 +22,5 @@ def __init__(self,nvim):
 
     def cm_refresh(self,info,ctx):
         getLogger(__name__).debug('Running a refresh…')
-        matches = self._cider_completion_manager.gather_candidates(re.search(info['word_pattern'], ctx['typed']).group(0))
+        matches = self._cider_completion_manager.gather_candidates(ctx['base'])
         self._nvim.call('cm#complete', info['name'], ctx, ctx['startcol'], matches, 1, async=True)