Pass the style parameter to DrawerControllerIOS (#578)

Now the style parameter is used inside RCCDrawerController but it's not passed through startTabBasedApp/startSingleScreenApp. Passing the style parameter allows to disable sidebar shadow trough style.drawerShadow.

src/deprecated/platformSpecificDeprecated.ios.js

                                disableOpenGesture={params.drawer.disableOpenGesture}
                                type={params.drawer.type ? params.drawer.type : 'MMDrawer'}
                                animationType={params.drawer.animationType ? params.drawer.animationType : 'slide'}
+                               style={params.drawer.style}
           >
             {this.renderBody()}
           </DrawerControllerIOS>
                                disableOpenGesture={params.drawer.disableOpenGesture}
                                type={params.drawer.type ? params.drawer.type : 'MMDrawer'}
                                animationType={params.drawer.animationType ? params.drawer.animationType : 'slide'}
+                               style={params.drawer.style}
           >
             {this.renderBody()}
           </DrawerControllerIOS>