style: Remove useless blank line to make linter happy

(cherry picked from commit 9e7a5ebebb)

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2440>

front/src/router/guards.ts

@@ -1,4 +1,3 @@
-
 import type { NavigationGuardNext, RouteLocationNamedRaw, RouteLocationNormalized } from 'vue-router'
 import type { Permission } from '~/store/auth'