Fixed unimportant general button style uses the wrong colors.

res/drawable/unimportant_outline_button_medium_background.xml

@@ -7,5 +7,5 @@
 
     <corners android:radius="@dimen/medium_button_corner_radius" />
 
-    <stroke android:width="@dimen/border_thickness" android:color="?colorAccent" />
+    <stroke android:width="@dimen/border_thickness" android:color="?android:textColorPrimary" />
 </shape>

res/values/styles.xml

@@ -92,12 +92,12 @@
 
     <style name="Widget.Session.Button.Common.UnimportantFilled">
         <item name="android:background">@drawable/unimportant_filled_button_medium_background</item>
-        <item name="android:textColor">?colorPrimary</item>
+        <item name="android:textColor">?android:textColorPrimary</item>
     </style>
 
     <style name="Widget.Session.Button.Common.UnimportantOutline">
         <item name="android:background">@drawable/unimportant_outline_button_medium_background</item>
-        <item name="android:textColor">?colorPrimary</item>
+        <item name="android:textColor">?android:textColorPrimary</item>
     </style>
 
     <style name="Widget.Session.Button.Dialog" parent="">