Fix linting error

Author: jahn96

src/CodeSnippetEditor.tsx

@@ -450,20 +450,21 @@ export class CodeSnippetEditor extends ReactWidget {
       console.log(newSnippet);
 
       if (oldName.toLowerCase() === newSnippet.name.toLowerCase()) {
-
         const oldSnippet = this.contentsService.getSnippet(oldName)[0];
-        saveOverWriteFile(this.contentsService, oldSnippet, newSnippet).then((res: boolean) => {
-          if (res) {
-            this.contentsService
-            .modifyExistingSnippet(oldName, newSnippet)
-            .then((res: boolean) => {
-              if (!res) {
-                console.log('Error in modifying snippet');
-                return false;
-              }
-            });
+        saveOverWriteFile(this.contentsService, oldSnippet, newSnippet).then(
+          (res: boolean) => {
+            if (res) {
+              this.contentsService
+                .modifyExistingSnippet(oldName, newSnippet)
+                .then((res: boolean) => {
+                  if (!res) {
+                    console.log('Error in modifying snippet');
+                    return false;
+                  }
+                });
+            }
           }
-        })
+        );
       }
     }