Add refs.* to valid event handler callees warning message

src/validate/html/validateEventHandler.ts

@@ -43,7 +43,7 @@ export default function validateEventHandlerCallee(
 		return;
 	}
 
-	const validCallees = ['this.*', 'event.*', 'options.*', 'console.*'].concat(
+	const validCallees = ['this.*', 'refs.*', 'event.*', 'options.*', 'console.*'].concat(
 		Array.from(validBuiltins),
 		Array.from(validator.methods.keys())
 	);

test/validator/samples/method-nonexistent-helper/warnings.json

@@ -1,6 +1,6 @@
 [{
 	"code": "invalid-callee",
-	"message": "'foo' is an invalid callee (should be one of this.*, event.*, options.*, console.*, set, fire, destroy or bar). 'foo' exists on 'helpers', did you put it in the wrong place?",
+	"message": "'foo' is an invalid callee (should be one of this.*, refs.*, event.*, options.*, console.*, set, fire, destroy or bar). 'foo' exists on 'helpers', did you put it in the wrong place?",
 	"pos": 18,
 	"start": {
 		"line": 1,

test/validator/samples/method-nonexistent/warnings.json

@@ -1,6 +1,6 @@
 [{
 	"code": "invalid-callee",
-	"message": "'foo' is an invalid callee (should be one of this.*, event.*, options.*, console.*, set, fire, destroy or bar)",
+	"message": "'foo' is an invalid callee (should be one of this.*, refs.*, event.*, options.*, console.*, set, fire, destroy or bar)",
 	"pos": 18,
 	"start": {
 		"line": 1,

test/validator/samples/window-event-invalid/warnings.json

@@ -1,6 +1,6 @@
 [{
 	"code": "invalid-callee",
-	"message": "'resize' is an invalid callee (should be one of this.*, event.*, options.*, console.*, set, fire or destroy)",
+	"message": "'resize' is an invalid callee (should be one of this.*, refs.*, event.*, options.*, console.*, set, fire or destroy)",
 	"start": {
 		"line": 1,
 		"column": 26,