use proper text color and semi-transparent chip background color on mention-chips

Resolves #1131

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

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

@@ -53,7 +53,7 @@
     </style>
 
     <style name="ChipIncomingTextAppearance" parent="TextAppearance.MaterialComponents.Chip">
-        <item name="android:textColor">@color/nc_incoming_text_default</item>
+        <item name="android:textColor">#de000000</item>
     </style>
 
     <style name="ChipOutgoingTextAppearance" parent="TextAppearance.MaterialComponents.Chip">

app/src/main/res/xml/chip_others.xml

@@ -22,5 +22,5 @@
 <chip xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:textAppearance="@style/ChipIncomingTextAppearance"
-    app:chipBackgroundColor="@color/white"
+    app:chipBackgroundColor="#deffffff"
     app:closeIconEnabled="false" />