Change Developer Options search to be single-line

Now pressing the enter key will exit the keyboard instead of clearing
filtered results.

Test: manual
Bug: 269200077
Change-Id: I9b717aa3300cad1eede874108e50dd62eeec82ff
diff --git a/res/layout/home_settings.xml b/res/layout/home_settings.xml
index 0f2461a..c0f16e2 100644
--- a/res/layout/home_settings.xml
+++ b/res/layout/home_settings.xml
@@ -12,6 +12,9 @@
         android:layout_marginHorizontal="@dimen/developer_options_filter_margins"
         android:hint="@string/developer_options_filter_hint"
         android:visibility="gone"
+        android:inputType="text"
+        android:maxLines="1"
+        android:imeOptions="actionDone"
         />
 
     <FrameLayout