[PM-4857] Hide "Allow screen capture" on iOS (#2873)

* PM-4857 Hide "Allow screen capture" on iOS

* PM-4857 Try to fix FDroid build by forcing .NET 7

* PM-4857 Try to fix FDroid build by forcing .NET 7, adding rollForward and disable allowPrerelease to the global json

* PM-4857 Changed global.json to use 7.0.400 so FDroid pass in CI

global.json

@@ -0,0 +1,7 @@
+{
+  "sdk": {
+    "version": "7.0.400",
+    "rollForward": "latestPatch",
+    "allowPrerelease": false
+  }
+}

src/App/Pages/Settings/OtherSettingsPage.xaml

@@ -53,6 +53,7 @@
                 Title="{u:I18n AllowScreenCapture}"
                 IsToggled="{Binding IsScreenCaptureAllowed}"
                 IsEnabled="{Binding CanToggleeScreenCaptureAllowed}"
+                IsVisible="{OnPlatform Android=True, iOS=False}"
                 AutomationId="AllowScreenCaptureSwitch"
                 StyleClass="settings-item-view"
                 HorizontalOptions="FillAndExpand" />