weldr/store: correctly update compose status

The entries in the map are stored by value, we must write them back
after modifying them.

Signed-off-by: Tom Gundersen <teg@jklm.no>

internal/weldr/store.go

@@ -76,6 +76,7 @@ func newStore(initialState []byte, stateChannel chan<- []byte, pendingJobs chan<
 						compose.JobFinished = time.Now()
 					}
 					compose.QueueStatus = update.Status
+					s.Composes[update.ComposeID] = compose
 				}
 			})
 		}