VmTerminalApp: Set activity label of settings activity

More clean up of aosp/3380145

Bug: 376780875
Test: Manually
Change-Id: I36b4214417fdcf0e3c210d47c03afc1db42d2a5e
diff --git a/android/TerminalApp/AndroidManifest.xml b/android/TerminalApp/AndroidManifest.xml
index 495598b..7dab58d 100644
--- a/android/TerminalApp/AndroidManifest.xml
+++ b/android/TerminalApp/AndroidManifest.xml
@@ -46,7 +46,8 @@
                 <category android:name="android.intent.category.DEFAULT" />
             </intent-filter>
         </activity>
-        <activity android:name=".SettingsActivity" />
+        <activity android:name=".SettingsActivity"
+            android:label="@string/action_settings" />
         <activity android:name=".SettingsDiskResizeActivity"
             android:label="@string/settings_disk_resize_title" />
         <activity android:name=".SettingsPortForwardingActivity"