Change AppPicker theme from dialog to full screen

AppPicker used in devceloper options, it will show apps list with
package name in a dialog.
But sometimes it will mis-alignment with package name.
So we change theme from dialog to full screen and set widget_frame
visibility to GONE.

Bug: 151150544
Test: manual
Change-Id: I8f04ab7967288801e5e13ecccf037d6ed09ec71c
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index a6ba436..643f85c 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -1981,8 +1981,7 @@
         </activity>
 
         <activity android:name=".development.AppPicker"
-                  android:label="@string/select_application"
-                  android:theme="@android:style/Theme.DeviceDefault.Light.Dialog" />
+                  android:label="@string/select_application" />
 
         <activity android:name=".development.DSULoader"
                   android:label="Select DSU Package"