add error message for gaming mode not being purchased

Author: sds100

base/src/main/java/io/github/sds100/keymapper/base/utils/ErrorUtils.kt

@@ -455,10 +455,16 @@ fun KMError.getFullMessage(resourceProvider: ResourceProvider): String {
                     resourceProvider.getString(
                         R.string.purchasing_error_assistant_not_purchased_home_screen,
                     )
+
                 ProductId.FLOATING_BUTTONS ->
                     resourceProvider.getString(
                         R.string.purchasing_error_floating_buttons_not_purchased_home_screen,
                     )
+
+                ProductId.GAMING_MODE ->
+                    resourceProvider.getString(
+                        R.string.purchasing_error_gaming_mode_not_purchased_home_screen,
+                    )
             }
 
         PurchasingError.PurchasingNotImplemented ->

base/src/main/res/values/strings.xml

@@ -1383,6 +1383,7 @@
     <string name="purchasing_contact_developer_button">Contact developer</string>
     <string name="purchasing_error_assistant_not_purchased_home_screen">You must purchase the side key trigger feature! Tap on the key map and then purchase it by clicking on \'Advanced triggers\'.</string>
     <string name="purchasing_error_floating_buttons_not_purchased_home_screen">You must purchase the floating buttons feature! Tap on the key map and then purchase it by clicking on \'Advanced triggers\'.</string>
+    <string name="purchasing_error_gaming_mode_not_purchased_home_screen">You must purchase the gaming mode feature!</string>
     <string name="purchasing_contact_email" translatable="false">contact@keymapper.club</string>
     <string name="customer_email_subject" translatable="false">Key Mapper Pro query</string>
     <string name="customer_email_body" translatable="false">Please fill the following information so I can help you.\n\n1. Device model:\n2. Android version:\n3. Key maps (make a back up in the home screen menu):\n4. Screenshot of Key Mapper home screen:\n5. Describe the problem you are having:</string>