Allow tagged template injections to accept function parameters

This change fixes #634 which reports that the Tree-Sitter JavaScript grammar
does not correctly highlight tagged template injections which have function
parameters, such as those used in the Styled Components library.  The fix
enables tagged template injections to be highlighted correctly when the template
invocation includes function arguments.

Author: daviwil

lib/main.js

@@ -9,6 +9,8 @@ exports.activate = function () {
       switch (firstChild.type) {
         case 'identifier':
           return languageStringForTemplateTag(firstChild.text)
+        case 'call_expression':
+          return languageStringForTemplateTag(firstChild.children[0].text)
         case 'member_expression':
           if (firstChild.startPosition.row === firstChild.endPosition.row) {
             return languageStringForTemplateTag(firstChild.text)