fix(dialog): use height behavior in KeyboardAvoidingView

react/features/base/dialog/components/native/BaseDialog.js

     type State
 } from '../AbstractDialog';
 import { brandedDialog as styles } from './styles';
-import { Platform } from '../../../react';
 
 export type Props = AbstractProps & {
 
         return (
             <TouchableWithoutFeedback>
                 <KeyboardAvoidingView
-                    behavior = { Platform.OS === 'ios' ? 'padding' : 'height' }
+                    behavior = 'height'
                     style = { [
                         styles.overlay,
                         style