Reverse default port count virtualbox argument

As we know the exact versions that used the old `sataportcount` option, it's safe to assume we want to use the newer `portcount` option for everything else.

Reversed the option check and use the `portcount` option by default. Prevents needing to update this for future major versions of VirtualBox.

builder/virtualbox/common/driver_4_2.go

@@ -24,9 +24,9 @@ func (d *VBox42Driver) CreateSATAController(vmName string, name string, portcoun
 		return err
 	}
 
-	portCountArg := "--sataportcount"
-	if strings.HasPrefix(version, "4.3") || strings.HasPrefix(version, "5.") || strings.HasPrefix(version, "6.") {
-		portCountArg = "--portcount"
+	portCountArg = "--portcount"
+	if strings.HasPrefix(version, "1.") || strings.HasPrefix(version, "2.") || strings.HasPrefix(version, "3.") || strings.HasPrefix(version, "4.0") || strings.HasPrefix(version, "4.1") || strings.HasPrefix(version, "4.2") {
+		portCountArg := "--sataportcount"
 	}
 
 	command := []string{