Remove duplicate function

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

integration/tsic/tsic.go

@@ -176,19 +176,6 @@ func (t *TailscaleInContainer) Version() string {
 	return t.version
 }
 
-func (t *TailscaleInContainer) WaitForReady() error {
-	return t.pool.Retry(func() error {
-		// If tailscaled has not started yet, this will return a non-zero
-		// status code
-		_, err := t.Execute([]string{"tailscale", "status"})
-		if err != nil {
-			return err
-		}
-
-		return nil
-	})
-}
-
 func (t *TailscaleInContainer) Execute(
 	command []string,
 ) (string, string, error) {