Reload EULA should not be tied to checkbox status

[joebochill]

Related: etn-ccis/blui-react-workflows#549

Describe the bug / expected behavior

The EULA base screen currently determines whether to show the 'Reload' component based on the disabled state of the checkbox. The checkbox enabled/disabled status is completely unrelated to whether or not the EULA successfully loaded or not.

What are the steps to reproduce?

1. https://github.com/etn-ccis/blui-react-native-workflows/blob/release/R31/login-workflow/src/screens/EulaScreen/EulaScreenBase.tsx#L121

Suggested fix

Add a new prop to the EULAScreenBase:

refreshConfig?: {
    onRefresh?: () => void;
    showRefreshButton?: boolean;
    refreshButtonLabel?: string;
}