Make SIM import screen an activity

This fixes an accessibility bug where the toolbar navigation icon was
announced instead of the title when the screen is displayed

test
* manually verify that SIM import works as previously when launched from
  settings and from assistant.
* manually verify that activity label is announced instead of navigation
  icon

Bug 32947074

Change-Id: I1116d626f13842ad78e287c98dd3a051796b1f5f
diff --git a/res/values/strings.xml b/res/values/strings.xml
index a9f1dc4..a544c08 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -1879,11 +1879,11 @@
     <!-- Toast shown on settings screen when importing from SIM completes with an error -->
     <string name="sim_import_failed_toast">Failed to import SIM contacts</string>
 
-    <!-- Title of SIM import dialog for accessibility; this isn't displayed but is announced
-     by talkback when the window is shown -->
-    <string name="sim_import_dialog_title">Select contacts to import</string>
+    <!-- Title of the SIM import activity; this isn't displayed but is announced by talkback
+         when the window is first opened [CHAR LIMIT=40] -->
+    <string name="sim_import_title">Import from SIM</string>
 
-    <!-- Content description of the cancel navigation icon shown in SIM import dialog toolbar -->
+    <!-- Content description of the cancel navigation icon shown in SIM import screen toolbar -->
     <string name="sim_import_cancel_content_description">Cancel import</string>
 
     <!-- Alert for letting user know that their device auto-sync setting is turned off,