fix: prevent svelte_component_invalid_this_value false positives

Also check for the function name: `$$component` is rare enough (if even allowed - it's not inside `.svelte(.js)` files) to remove most of not all false positives

Author: dummdidumm

.changeset/rotten-glasses-own.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: prevent `svelte_component_invalid_this_value` false positives

packages/svelte/src/internal/client/validate.js

@@ -31,7 +31,7 @@ export function validate_dynamic_component(component_fn) {
 	} catch (err) {
 		const { message } = /** @type {Error} */ (err);
 
-		if (typeof message === 'string' && message.indexOf('is not a function') !== -1) {
+		if (typeof message === 'string' && message.indexOf('$$component is not a function') !== -1) {
 			e.svelte_component_invalid_this_value();
 		}