Handle val with string interpolation pattern

Fixes scala#233

Author: nicolasstucki

src/typescript/Scala.tmLanguage.ts

@@ -803,7 +803,7 @@ export const scalaTmLanguage: TmLanguage = {
           }
         },
         { // val x1[, x2, x3, ...] = y
-          match: `\\b(val)\\b\\s*${notStartOfComment}(${anyId}(?:\\s*,\\s*${anyId})*)?`,
+          match: `\\b(val)\\b\\s*${notStartOfComment}(${anyId}(?!")(?:\\s*,\\s*${anyId})*)?`,
           captures: {
             '1': {
               name: 'keyword.declaration.stable.scala'
@@ -814,7 +814,7 @@ export const scalaTmLanguage: TmLanguage = {
           }
         },
         { // var x1[, x2, x3, ...] = y
-          match: `\\b(var)\\b\\s*${notStartOfComment}(${anyId}(?:\\s*,\\s*${anyId})*)?`,
+          match: `\\b(var)\\b\\s*${notStartOfComment}(${anyId}(?!")(?:\\s*,\\s*${anyId})*)?`,
           captures: {
             '1': {
               name: 'keyword.declaration.volatile.scala'