fix: adjust ambient module snipping logic

Since sveltejs/svelte#12061 the `declare module "*.svelte" {..}` declaration contains more closing braces and the logic to snip it out is now outdated. This updates the logic to instead look for the first bracket that comes directly after one line.

Author: dummdidumm

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

@@ -136,7 +136,7 @@ export namespace DocumentSnapshot {
 
         if (normalizedPath.endsWith('node_modules/svelte/types/index.d.ts')) {
             const startIdx = originalText.indexOf(`declare module '*.svelte' {`);
-            const endIdx = originalText.indexOf(`}`, originalText.indexOf(';', startIdx)) + 1;
+            const endIdx = originalText.indexOf(`\n}`, startIdx + 1) + 2;
             originalText =
                 originalText.substring(0, startIdx) +
                 ' '.repeat(endIdx - startIdx) +

packages/typescript-plugin/src/index.ts

@@ -67,8 +67,7 @@ function init(modules: { typescript: typeof ts }): ts.server.PluginModule {
                 if (snapshot) {
                     const originalText = snapshot.getText(0, snapshot.getLength());
                     const startIdx = originalText.indexOf(`declare module '*.svelte' {`);
-                    const endIdx =
-                        originalText.indexOf(`}`, originalText.indexOf(';', startIdx)) + 1;
+                    const endIdx = originalText.indexOf(`\n}`, startIdx + 1) + 2;
                     return modules.typescript.ScriptSnapshot.fromString(
                         originalText.substring(0, startIdx) +
                             ' '.repeat(endIdx - startIdx) +