Contact Diary Polishing 3 (#1934)

* Changed background color on onboarding screen

* Updated back navigation

* clean

Co-authored-by: BMItter <berndus@gmx.de>
Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>
Co-authored-by: AlexanderAlferov <64849422+AlexanderAlferov@users.noreply.github.com>

Corona-Warn-App/src/main/java/de/rki/coronawarnapp/contactdiary/ui/onboarding/ContactDiaryOnboardingFragment.kt

@@ -4,7 +4,6 @@ import android.os.Bundle
 import android.view.View
 import androidx.fragment.app.Fragment
 import de.rki.coronawarnapp.R
-import de.rki.coronawarnapp.contactdiary.ui.ContactDiaryActivity
 import de.rki.coronawarnapp.contactdiary.ui.ContactDiarySettings
 import de.rki.coronawarnapp.databinding.ContactDiaryOnboardingFragmentBinding
 import de.rki.coronawarnapp.util.di.AutoInject
@@ -45,7 +44,7 @@ class ContactDiaryOnboardingFragment : Fragment(R.layout.contact_diary_onboardin
             when (it) {
 
                 ContactDiaryOnboardingNavigationEvents.NavigateToMainActivity -> {
-                    (requireActivity() as ContactDiaryActivity).finish()
+                    requireActivity().onBackPressed()
                 }
 
                 ContactDiaryOnboardingNavigationEvents.NavigateToPrivacyFragment -> {

Corona-Warn-App/src/main/res/layout/contact_diary_onboarding_fragment.xml

@@ -6,7 +6,8 @@
 
     <androidx.constraintlayout.widget.ConstraintLayout
         android:layout_width="match_parent"
-        android:layout_height="match_parent">
+        android:layout_height="match_parent"
+        android:background="@drawable/card">
 
         <include
             android:id="@+id/contact_diary_onboarding_header"