Fix Status Bar Icon Brightness (#162297)
On Android devices, the statusBar is now by default transparent starting
android API 35
[here](https://developer.android.com/develop/ui/views/layout/edge-to-edge#:~:text=system%20bars%20transparent)
(due to automatic opt-in to edge to edge mode
[here](https://developer.android.com/develop/ui/views/layout/edge-to-edge#:~:text=Important%3A%20Edge%2Dto%2Dedge%20is%20enforced%20on%20Android%2015%20(API%20level%2035)%20and%20higher%20once%20your%20app%20targets%20SDK%2035.%20If%20your%20app%20is%20not%20already%20edge%2Dto%2Dedge%2C%20portions%20of%20your%20app%20may%20be%20obscured%20and%20you%20must%20handle%20insets.%20Depending%20on%20the%20app%2C%20this%20work%20may%20or%20may%20not%20be%20significant.)),
which is making the statusBar icons difficult to see. We decided to make
the change in Cupertino/Material layer as opposed to the embedder layer
becasue we cannot make assumptions on the defaults when we don't know
what kind of Widgets the Flutter dev will be using.
In MaterialApp, the `statusBarIconBrightness` is made to be dark because
the system's brightness (dark mode or light mode) **does not affect**
the brightness of the default app. This means when I turn on dark mode
on my phone, the app does not use a dark theme—it uses the same light
theme.
In CupertinoApp, the `statusBarIconBrightness` is made to be opposite of
the system's brightness (dark mode or light mode) because the system
**does affect** the brightness of the default app. The system and the
default app have the same brightness. This means when I turn on dark
mode on my phone, the app also uses a dark theme.
Fixes #160305
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