overlay: Change vvm_type_vvm3_mvno to vvm_type_vvm3

* Google Dialer, where these values have been extracted from, apparently
  does use that type, but our Dialer doesn't support it at all
* Change it to the one we support and hope more users can now use
  VisualVoiceMail

Co-authored-by: Joel Beckmeyer <jbeckmeyer@cedarville.edu>
Change-Id: I7e602fc9c591620b5306c187cde11afac2fd697f

overlay/common/packages/apps/Dialer/java/com/android/voicemail/impl/res/xml/vvm_config.xml

@@ -209,7 +209,7 @@
         </string-array>
         <int name="vvm_port_number_int" value="0" />
         <string name="vvm_destination_number_string">900080006200</string>
-        <string name="vvm_type_string">vvm_type_vvm3_mvno</string>
+        <string name="vvm_type_string">vvm_type_vvm3</string>
         <string name="vvm_client_prefix_string">//VZWVVM</string>
         <boolean name="vvm_cellular_data_required_bool" value="true" />
         <boolean name="vvm_legacy_mode_enabled_bool" value="true" />
@@ -223,7 +223,7 @@
         </string-array>
         <int name="vvm_port_number_int" value="0" />
         <string name="vvm_destination_number_string">900080006200</string>
-        <string name="vvm_type_string">vvm_type_vvm3_mvno</string>
+        <string name="vvm_type_string">vvm_type_vvm3</string>
         <string name="vvm_client_prefix_string">//VZWVVM</string>
         <boolean name="vvm_cellular_data_required_bool" value="true" />
         <boolean name="vvm_legacy_mode_enabled_bool" value="true" />
@@ -245,7 +245,7 @@
         </string-array>
         <int name="vvm_port_number_int" value="0" />
         <string name="vvm_destination_number_string">900080006200</string>
-        <string name="vvm_type_string">vvm_type_vvm3_mvno</string>
+        <string name="vvm_type_string">vvm_type_vvm3</string>
         <string name="vvm_client_prefix_string">//VZWVVM</string>
         <boolean name="vvm_cellular_data_required_bool" value="true" />
         <boolean name="vvm_legacy_mode_enabled_bool" value="true" />