Fixes highlighting for finally in certain cases.

[thomasstep]

jsCatch can be followed by jsParenCatch or jsTryCatchBlock. A catch can either be followed directly by a block or optionally have parens for an error parameter. The original issue noticed that in the code

try {} catch {} finally {}

finally was not realized as a keyword. This PR fixes that by allowing the nextgroup to be either parens or a block.

[thomasstep]

Fixes #1222

[amadeus]

Hah - i totally fixed this locally and forgot to push it, thanks!