fix: don't use themed text color primary for the media send fragment (#1038)

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

@@ -95,7 +95,6 @@
 
                     <org.thoughtcrime.securesms.components.ComposeText
                         style="@style/Widget.Session.EditText.Compose"
-                        android:textColor="?android:textColorPrimary"
                         android:id="@+id/mediasend_compose_text"
                         android:layout_width="0dp"
                         android:layout_height="wrap_content"

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

@@ -154,6 +154,7 @@
     <style name="Widget.Session.EditText.Compose" parent="@style/Signal.Text.Body">
         <item name="android:padding">2dp</item>
         <item name="android:background">@null</item>
+        <item name="android:textColor">@color/white</item>
         <item name="android:maxLines">4</item>
         <item name="android:maxLength">65536</item>
         <item name="android:capitalize">sentences</item>