Move removing dependencies to inside settings check (#229)

When changing dependent files, they are being removed as dependencies when the file is being closed. This is causing problem associated with them to remain until VS Code is closed.

server/src/server.ts

@@ -299,9 +299,9 @@ function setupDocumentListener(): void {
   documents.onDidClose((event) => {
     resolveSettings(event.document).then((settings) => {
       const uri = event.document.uri;
-      documentSettings.delete(uri);
-      seenDependencies.delete(uri);
       if (settings.validate) {
+        documentSettings.delete(uri);
+        seenDependencies.delete(uri);
         // Clear any diagnostics associated with the document that closed.
         connection.sendDiagnostics({ uri: uri, diagnostics: [] });
       }