fix: create user tmp directory before the app one (#2395)

Otherwise on a shared machine, the `/tmp/k9s` directory will be owned by
the first user to lanch `k9s` command. The other users will get a
"permission denied" error.

internal/config/files.go

@@ -282,7 +282,7 @@ func userTmpDir() (string, error) {
 		return "", err
 	}
 
-	dir := filepath.Join(os.TempDir(), AppName, u.Username)
+	dir := filepath.Join(os.TempDir(), u.Username, AppName)
 
 	return dir, nil
 }