accounts: invalidate web user cache on changes as well

previously used app.jf.CacheExpiry = time.Now(), now either call
app.InvalidateJellyfinCache() (when we only need it to get a user),
or app.InvalidateUserCaches() (when the web user list needs to be
updated).

api-profiles.go

@@ -110,7 +110,7 @@ func (app *appContext) SetDefaultProfile(gc *gin.Context) {
 func (app *appContext) CreateProfile(gc *gin.Context) {
 	var req newProfileDTO
 	gc.BindJSON(&req)
-	app.jf.CacheExpiry = time.Now()
+	app.InvalidateJellyfinCache()
 	user, err := app.jf.UserByID(req.ID, false)
 	if err != nil {
 		app.err.Printf(lm.FailedGetUsers, lm.Jellyfin, err)