Enable limited use of iOS devices on non Mac devices

Summary:
Context: https://fb.workplace.com/groups/flippersupport/permalink/1005193786627946/

I believe we can land this without knowing that it works, because iOS support is still disabled by default for non mac devices - you have to enable it in settings to switch it on.

Reviewed By: passy

Differential Revision: D24893757

fbshipit-source-id: c9db515a7807c94a0d5e509017dd4e1796d24f6d

desktop/app/src/chrome/SettingsSheet.tsx

@@ -172,7 +172,6 @@ class SettingsSheet extends Component<Props, State> {
         <ToggledSection
           label="iOS Developer"
           toggled={enableIOS && this.props.platform === 'darwin'}
-          frozen={this.props.platform !== 'darwin'}
           onChange={(v) => {
             this.setState({
               updatedSettings: {...this.state.updatedSettings, enableIOS: v},
@@ -186,7 +185,9 @@ class SettingsSheet extends Component<Props, State> {
           )}
           {this.props.platform !== 'darwin' && (
             <ConfigText
-              content={'iOS development is only supported on MacOS'}
+              content={
+                'iOS development has limited functionality on non-MacOS devices'
+              }
             />
           )}
           <ToggledSection