highlights(tiger): fix captures

tests/query/highlights/tiger/imports.tig

@@ -1,4 +1,4 @@
 import "lib.tih"
-/* <- keyword */
+/* <- include */
 /*      ^ string.special */
 /* vim: set ft=tiger: */

tests/query/highlights/tiger/keywords.tig

@@ -10,7 +10,7 @@ let
   /* <- keyword.function */
 
   import "lib.tih"
-  /* <- keyword */
+  /* <- include */
 
   type array_of_int = array of int
   /* <- keyword */

tests/query/highlights/tiger/object-oriented.tig

@@ -12,13 +12,13 @@ let
     var a := 12
 
     method meth() : int = self.a
-    /* <- method */
+    /* <- keyword.function */
     /*     ^ method */
     /*                    ^ variable.builtin */
   }
 
   var object := new B
-  /*            ^ constructor */
+  /*            ^ keyword.operator */
 in
   object.a := 27;
   /*     ^ property */