Fade options in browser

# Feature Request

Like title says, I'd like to have the chance to tweak the duration of the fade in browser platform, or even avoid it.

## Motivation Behind Feature

It would be useful, like it is in android

## Feature Description

Is it needed? ahaha

## Alternatives or Workarounds

Nothing, actually

Start by locating the browser-platform implementation for this Cordova splashscreen plugin and its existing fade behavior. Confirm the desired duration and disable options, then define browser-specific tests for both outcomes; done means the options work without changing other platforms.

Written by the indexing model from the issue text.