fix and improve auto game path detection

preload.js

@@ -4,15 +4,16 @@ contextBridge.exposeInMainWorld('versions', {
   node: () => process.versions.node,
   chrome: () => process.versions.chrome,
   electron: () => process.versions.electron
-})
+});
 
 contextBridge.exposeInMainWorld('save', {
   saveSilksongPath: (path) =>
     ipcRenderer.invoke('save-path', path),
   loadSilksongPath: () =>
     ipcRenderer.invoke('load-path')
-})
+});
 
 contextBridge.exposeInMainWorld('files', {
-  fileExists: (path) => ipcRenderer.invoke('file-exists', path)
+  fileExists: (path) => ipcRenderer.invoke('file-exists', path),
+  userSavePath: () => ipcRenderer.invoke('get-userSavePath')
 });