fix missing reference

Author: isabelrios

app/src/androidTest/java/mozilla/lockbox/robots/EditCredentialRobot.kt

@@ -10,6 +10,7 @@ import android.view.KeyEvent
 import androidx.test.espresso.Espresso.onView
 import androidx.test.espresso.action.ViewActions.click
 import androidx.test.espresso.action.ViewActions.replaceText
+import androidx.test.espresso.action.ViewActions.pressKey
 import androidx.test.espresso.matcher.ViewMatchers.withId
 import br.com.concretesolutions.kappuccino.actions.ClickActions
 import br.com.concretesolutions.kappuccino.assertions.VisibilityAssertions