Remove miniresolver header elevation

Header elevation caused a line to be drawn beneath the header.

Fix: 323482191
Test: manual testing: launch miniresolver and check that there's no line
 beneath the header in both the light and the dark theme.
Change-Id: Ia047e4b3c39a5991387c64374d2379bcab708b75
diff --git a/core/res/res/layout/miniresolver.xml b/core/res/res/layout/miniresolver.xml
index db0ea54..e60e0b0 100644
--- a/core/res/res/layout/miniresolver.xml
+++ b/core/res/res/layout/miniresolver.xml
@@ -33,7 +33,6 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_alwaysShow="true"
-        android:elevation="@dimen/resolver_elevation"
         android:paddingTop="24dp"
         android:paddingStart="@dimen/resolver_edge_margin"
         android:paddingEnd="@dimen/resolver_edge_margin"