message: [Map] Make user indicator purple.
  Fixes
diff: #import "ARMapComponentViewController.h"
  +#import <react-native-mapbox-gl/RCTMGLMapView.h>
  @implementation ARMapComponentViewController
  ++ (void)initialize {
  + UIColor *purple100 = [UIColor colorWithRed:110.0f/255.0f green:30.0f/255.0f blue:255.0f/255.0f alpha:1.0f];
  + [[RCTMGLMapView appearanceWhenContainedInInstancesOfClasses:@[self]] setTintColor:purple100];
  +}
  +
  - (instancetype)init
  {
  return [super initWithEmission:nil moduleName:@"Map" initialProperties:nil];
  