Update src/JeffWilcox.PhoneThemeManager/ThemeManager.cs

Tweaked to allow PhoneRadioCheckBoxPressedBrush and PhoneTextBoxEditBorderBrush  to match both WP8 and WP7 built in themes
Merge pull request #6 from l3v5y/patch-1

Update src/JeffWilcox.PhoneThemeManager/ThemeManager.cs