python: Inline expectation should have space after $

This was a regex-find-replace from `# \$(?! )` (using a negative lookahead) to `# $ `.

python/ql/test/library-tests/regexparser/locations.py

@@ -10,7 +10,7 @@ import re
 # Comments indicate the found locations relative to the call to `compile`.
 
 # plain string
-re.compile( # $location=1:2
+re.compile( # $ location=1:2
 '[this] is a test'
 )
 
@@ -97,4 +97,4 @@ r'\A[this] is a test'
 re.compile( # $ location=1:2 SPURIOUS:location=1:23 MISSING:location=2:6
 '[this] is a test\
  and [this] is another test'
-)
+)