linkgrammar.py: Fix whitespace
linkgrammar.py: Fix whitespace

Reduce the number of pylint complaints.

MadBomber/link-grammar,MadBomber/link-grammar,opencog/link-grammar,opencog/link-grammar,opencog/link-grammar,opencog/link-grammar,linas/link-grammar,linas/link-grammar,ampli/link-grammar,MadBomber/link-grammar,ampli/link-grammar,MadBomber/link-grammar,ampli/link-grammar,MadBomber/link-grammar,opencog/link-grammar,linas/link-grammar,linas/link-grammar,MadBomber/link-grammar,MadBomber/link-grammar,opencog/link-grammar,linas/link-grammar,opencog/link-grammar,linas/link-grammar,ampli/link-grammar,linas/link-grammar,ampli/link-grammar,ampli/link-grammar,ampli/link-grammar,opencog/link-grammar,ampli/link-grammar,opencog/link-grammar,linas/link-grammar,ampli/link-grammar,MadBomber/link-grammar,linas/link-grammar