fix: ToggleSwitch knob does not respect the Foreground property

[agaldanaw2]

closes #893

PR Type

What kind of change does this PR introduce?

• Bugfix

Description

Right now setting Foreground or Background of the ToggleSwitch should be reflected in the switch.

PR Checklist

Please check if your PR fulfills the following requirements:

• Commits must be following the Conventional Commits specification
• Tested UWP
• Tested iOS
• Tested Android
• Tested WASM
• Tested MacOS
• Contains No breaking changes

  If the pull request contains breaking changes, commit message must contain a detailed description of the action to take for the consumer of this library. As explained by the Conventional Commits specification

Other information

with this changes setting Background and Foreground be reflected in the switch.

1. Setting foreground: using this xaml the result is: <ToggleSwitch Header="On change Foreground" Foreground="Green" IsOn="True" />
   

2. Setting background: using this xaml the result is: <ToggleSwitch Header="On change Background" Background="Red" IsOn="True" />
   

3. Setting background and foreground: using this xaml the result is: <ToggleSwitch Header="On change Background and Foreground" Background="Red" Foreground="Red" IsOn="True" />
   

Internal Issue (If applicable):

This is the issue