fix: use Svelte 4 compiler from user when available

Svelte 4 has some fixes with regards to parsing the generics attribute.
#2039

Author: dummdidumm

packages/language-server/src/plugins/typescript/service.ts

@@ -233,10 +233,11 @@ async function createLanguageService(
         svelteTsPath = __dirname;
     }
     const sveltePackageInfo = getPackageInfo('svelte', tsconfigPath || workspacePath);
+    // Svelte 4 has some fixes with regards to parsing the generics attribute.
     // Svelte 5 has new features, but we don't want to add the new compiler into language-tools. In the future it's probably
     // best to shift more and more of this into user's node_modules for better handling of multiple Svelte versions.
     const svelteCompiler =
-        sveltePackageInfo.version.major >= 5
+        sveltePackageInfo.version.major >= 4
             ? importSvelte(tsconfigPath || workspacePath)
             : undefined;