[dotnet] Small performance improvement for DriverFactory (#12497)

Small performance improvement for DriverFactory

I noticed in 962a34b that an `if`-statement was used, while probably an `else-if` should have been used, to skip all other conditions when the Chrome driver is used.

dotnet/test/common/Environment/DriverFactory.cs

@@ -46,7 +46,7 @@ public IWebDriver CreateDriverWithOptions(Type driverType, DriverOptions driverO
                 browser = Browser.Chrome;
                 options = GetDriverOptions<ChromeOptions>(driverType, driverOptions);
             }
-            if (typeof(EdgeDriver).IsAssignableFrom(driverType))
+            else if (typeof(EdgeDriver).IsAssignableFrom(driverType))
             {
                 browser = Browser.Edge;
                 options = GetDriverOptions<EdgeOptions>(driverType, driverOptions);