#1757 Further changes on Combine "Nop.Plugin.Tax.CountryStateZip" and "Nop.Plugin.Tax.FixedRate"

Upgrade instructions: do not forget to manually delete "/Plugins/Tax.FixedRate" and "/Plugins/Tax.CountryStateZip" directories (they are not used anymore), and replace the plugin «Tax.FixedRate» or «Tax.CountryStateZip» by the plugin «Tax.FixedOrByCountryStateZip» in the App_Data/InstalledPlugins.txt file.

Author: skoshelev

src/Libraries/Nop.Services/Installation/CodeFirstInstallationService.cs

@@ -6171,7 +6171,7 @@ protected virtual void InstallSettings()
             {
                 TaxBasedOn = TaxBasedOn.BillingAddress,
                 TaxDisplayType = TaxDisplayType.ExcludingTax,
-                ActiveTaxProviderSystemName = "Tax.FixedRate",
+                ActiveTaxProviderSystemName = "Tax.FixedOrByCountryStateZip",
                 DefaultTaxAddressId = 0,
                 DisplayTaxSuffix = false,
                 DisplayTaxRates = false,