fix: make SafeAreaView respect edges param on web

[klxiaoniu]

Summary

The following code works fine on Android and iOS, but on Web the padding will be set to all edges despite what we set. When getEdgeValue is called with the third value undefined, which means the inset is not required, it will apply inset incorrectly.

import { SafeAreaView } from 'react-native-safe-area-context';

<SafeAreaView edges={['bottom']}>
    ...
</SafeAreaView>

Test Plan

Use the latest code to run on web to se if edges are applied properly.

[Copilot]

Pull request overview

This PR fixes a bug in the web implementation of SafeAreaView where the edges parameter was not being respected correctly. When specific edges were provided (e.g., edges={['bottom']}), all edges were still receiving insets instead of only the specified ones.

Changes:

• Reordered the switch cases in getEdgeValue function to make undefined edge modes default to 'off' behavior (no inset) instead of 'additive' behavior (applying inset)

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