Fix `SpaceInsideBrackets` for `Hash#[]` calls

A left bracket can be either of the type `:tLBRACK` or `:tLBRACK2`.

`SpaceInsideBrackets` only checked for `:tLBRACK`, so method calls like `Hash#[]` with spaces after the left bracket (e.g. `hsh[ :key]`) didn't get detected as an offense, because they are of the type `:tLBRACK2`.

Fixed by allowing multiple types for the left side in `SpaceInside`.