fix(JekyllSettings.ts): adding convertFileName to the title variable

The error in not converting the file name occurs because the change is being made only in the front matter, which causes the inconsistency.

src/jekyll/settings/JekyllSettings.ts

@@ -1,4 +1,5 @@
 import { O2PluginSettings } from '../../settings';
+import { convertFileName } from '../../FilenameConverter';
 
 export default class JekyllSettings implements O2PluginSettings {
   private _jekyllPath: string;
@@ -9,6 +10,7 @@ export default class JekyllSettings implements O2PluginSettings {
     day: string,
     title: string,
   ): string {
+    title = convertFileName(title);
     return `${year}-${month}-${day}-${title}.md`;
   }