Add background to sensitive media button (#3939)

Using the same background and margin as the ALT button.

Fixes #3772

app/src/main/res/layout/item_media_preview.xml

@@ -16,14 +16,15 @@
         android:id="@+id/status_sensitive_media_button"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:alpha="0.7"
+        android:layout_margin="3dp"
+        android:background="@drawable/media_warning_bg"
         android:contentDescription="@null"
         android:padding="@dimen/status_sensitive_media_button_padding"
         android:visibility="gone"
         app:layout_constraintStart_toStartOf="@+id/status_media_preview_container"
         app:layout_constraintTop_toTopOf="@+id/status_media_preview_container"
         app:srcCompat="@drawable/ic_eye_24dp"
-        app:tint="@color/white" />
+        app:tint="?android:attr/textColorSecondary" />
 
     <TextView
         android:id="@+id/status_sensitive_media_warning"

app/src/main/res/layout/item_report_status.xml

@@ -191,14 +191,15 @@
             android:id="@+id/status_sensitive_media_button"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:alpha="0.7"
+            android:layout_margin="3dp"
+            android:background="@drawable/media_warning_bg"
             android:contentDescription="@null"
             android:padding="@dimen/status_sensitive_media_button_padding"
             android:visibility="gone"
             app:layout_constraintLeft_toLeftOf="@+id/status_media_preview_container"
             app:layout_constraintTop_toTopOf="@+id/status_media_preview_container"
             app:srcCompat="@drawable/ic_eye_24dp"
-            app:tint="@color/white"
+            app:tint="?android:attr/textColorSecondary"
             tools:visibility="visible" />
 
         <TextView
@@ -359,4 +360,4 @@
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintTop_toBottomOf="@id/timestampInfo" />
 
-</androidx.constraintlayout.widget.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>