chore(tests): consistent captures

tests/query/highlights/wing/class.w

@@ -1,19 +1,19 @@
 bring cloud;
-// <- keyword
+// <- @keyword
 
 class Foo {
-// <- keyword
-//    ^   variable
-//        ^ punctuation.bracket
+// <- @keyword
+//    ^   @variable
+//        ^ @punctuation.bracket
   name: str;
-//^    field
-//      ^   type.builtin
-//         ^ punctuation.delimiter
+//^    @field
+//      ^   @type.builtin
+//         ^ @punctuation.delimiter
   new(name:  str) {
-//^    keyword
-//    ^    variable
+//^    @keyword
+//    ^    @variable
     this.name = name;
-//      ^ punctuation.delimiter
-//            ^ operator
+//      ^ @punctuation.delimiter
+//            ^ @operator
   }
 }

tests/query/highlights/wing/nested_method.w

@@ -1,4 +1,4 @@
 test1.test2.test3();
-// <- variable
-//    ^ property
-//          ^ method.call
+// <- @variable
+//    ^ @property
+//          ^ @method.call