metrics: Fix "You need to relogin" text
metrics: Fix "You need to relogin" text

This only applies to metrics history, not all of metrics. Use the same
string as for "Package cockpit-pcp is missing for metrics history".

cockpit-project/cockpit,mvollmer/cockpit,martinpitt/cockpit,martinpitt/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,martinpitt/cockpit,cockpit-project/cockpit,martinpitt/cockpit,mvollmer/cockpit,mvollmer/cockpit,martinpitt/cockpit,mvollmer/cockpit,mvollmer/cockpit