Fix theme for PostCallActivity

NoActionBar theme is more proper for PostCallActivity since no need any
title and a send button can have a vivid color when enabled.

Test: am start -n com.android.dialer/.postcall.PostCallActivity -e
"phone_number" "12345678"

Signed-off-by: Sungjae <sung_jae.kim@samsung.com>
Change-Id: I1971f5b2db2674f298f3f442f0113309d5523a7c
diff --git a/java/com/android/dialer/postcall/AndroidManifest.xml b/java/com/android/dialer/postcall/AndroidManifest.xml
index ca7fb71..82101a0 100644
--- a/java/com/android/dialer/postcall/AndroidManifest.xml
+++ b/java/com/android/dialer/postcall/AndroidManifest.xml
@@ -21,7 +21,7 @@
   <activity
       android:name="com.android.dialer.postcall.PostCallActivity"
       android:exported="false"
-      android:theme="@style/Theme.AppCompat.Light"
+      android:theme="@style/Dialer.ThemeBase.NoActionBar"
       android:windowSoftInputMode="adjustResize"/>
   </application>
 </manifest>