fix text color for dark mode

fix text color for dark mode in save file dialog from FullScreen*Activity

Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

app/src/main/res/values-v27/styles.xml

@@ -9,6 +9,8 @@
         <item name="android:windowActionBar">true</item>
         <item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
         <item name="colorSurface">@color/bg_default</item>
+        <item name="alertDialogTheme">@style/Theme.AppCompat.DayNight.Dialog</item>
+        <item name="android:alertDialogTheme">?alertDialogTheme</item>
     </style>
 
     <style name="FullScreenMediaTheme" parent="Theme.AppCompat.Light.NoActionBar">
@@ -19,5 +21,7 @@
         <item name="android:windowActionBar">true</item>
         <item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
         <item name="colorSurface">@color/bg_default</item>
+        <item name="alertDialogTheme">@style/Theme.AppCompat.DayNight.Dialog</item>
+        <item name="android:alertDialogTheme">?alertDialogTheme</item>
     </style>
 </resources>

app/src/main/res/values/styles.xml

@@ -222,6 +222,8 @@
         <item name="android:windowNoTitle">true</item>
         <item name="android:windowActionBar">true</item>
         <item name="colorSurface">@color/bg_default</item>
+        <item name="alertDialogTheme">@style/Theme.AppCompat.DayNight.Dialog</item>
+        <item name="android:alertDialogTheme">?alertDialogTheme</item>
     </style>
 
     <style name="FullScreenMediaTheme" parent="Theme.AppCompat.Light.NoActionBar">
@@ -231,6 +233,8 @@
         <item name="android:windowNoTitle">true</item>
         <item name="android:windowActionBar">true</item>
         <item name="colorSurface">@color/bg_default</item>
+        <item name="alertDialogTheme">@style/Theme.AppCompat.DayNight.Dialog</item>
+        <item name="android:alertDialogTheme">?alertDialogTheme</item>
     </style>
 
     <style name="TextInputLayoutTheme" parent="Theme.AppCompat">