fix: Syntax highlighting broken for record keys containing brackets (#232)

Author: mst-mkt

syntaxes/nushell.tmLanguage.json

@@ -571,7 +571,7 @@
         {
           "match": "(\"(?:[^\"\\\\]|\\\\.)*\")\\s*(:)\\s*",
           "captures": {
-            "1": { "name": "variable.other.nushell" },
+            "1": { "name": "string.quoted.double.nushell variable.other.nushell" },
             "2": { "name": "keyword.control.nushell" }
           },
           "name": "meta.record-entry.nushell"
@@ -591,7 +591,7 @@
         {
           "match": "('[^']*')\\s*(:)\\s*",
           "captures": {
-            "1": { "name": "variable.other.nushell" },
+            "1": { "name": "string.quoted.single.nushell variable.other.nushell" },
             "2": { "name": "keyword.control.nushell" }
           },
           "name": "meta.record-entry.nushell"