Get rid of legacy shared pref keys for port forwarding from config.xml

Bug: 380771744
Test: m
Change-Id: I0da27e5d2a1cc40730742be9bdd3ab430ff797f5
diff --git a/android/TerminalApp/res/values/config.xml b/android/TerminalApp/res/values/config.xml
index 6440ee6..713e1a5 100644
--- a/android/TerminalApp/res/values/config.xml
+++ b/android/TerminalApp/res/values/config.xml
@@ -17,8 +17,6 @@
 <resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
     <string name="preference_file_key" translatable="false">com.android.virtualization.terminal.PREFERENCE_FILE_KEY</string>
     <string name="preference_disk_size_key" translatable="false">PREFERENCE_DISK_SIZE_KEY</string>
-    <string name="preference_forwarding_ports" translatable="false">PREFERENCE_FORWARDING_PORTS</string>
-    <string name="preference_forwarding_port_is_enabled" translatable="false">PREFERENCE_FORWARDING_PORT_IS_ENABLED_</string>
 
     <bool name="terminal_portrait_only">true</bool>
 </resources>