[RN] Don't auto-capitalize email field in settings

react/features/settings/components/native/SettingsView.js

                     </FormRow>
                     <FormRow i18nLabel = 'settingsView.email'>
                         <TextInput
+                            autoCapitalize = 'none'
                             keyboardType = { 'email-address' }
                             onChangeText = { this._onChangeEmail }
                             placeholder = 'email@example.com'