fix: Use first user for telemetry email (#3761)

This was causing other users email to be sent, which isn't desired.

coderd/telemetry/telemetry.go

@@ -356,7 +356,7 @@ func (r *remoteReporter) createSnapshot() (*Snapshot, error) {
 			if firstUser.CreatedAt.IsZero() {
 				firstUser = dbUser
 			}
-			if dbUser.CreatedAt.After(firstUser.CreatedAt) {
+			if dbUser.CreatedAt.Before(firstUser.CreatedAt) {
 				firstUser = dbUser
 			}
 		}