iOS 13 activityIndicatorViewStyle check fix (#1418)

MJRefresh/Custom/Footer/Auto/MJRefreshAutoNormalFooter.m

@@ -37,7 +37,7 @@ - (void)prepare
 {
     [super prepare];
     
-#if __IPHONE_OS_VERSION_MAX_ALLOWED > 130000
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000
     if (@available(iOS 13.0, *)) {
         _activityIndicatorViewStyle = UIActivityIndicatorViewStyleMedium;
         return;

MJRefresh/Custom/Footer/Back/MJRefreshBackNormalFooter.m

@@ -51,7 +51,7 @@ - (void)prepare
 {
     [super prepare];
     
-#if __IPHONE_OS_VERSION_MAX_ALLOWED > 130000
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000
     if (@available(iOS 13.0, *)) {
         _activityIndicatorViewStyle = UIActivityIndicatorViewStyleMedium;
         return;

MJRefresh/Custom/Header/MJRefreshNormalHeader.m

@@ -52,7 +52,7 @@ - (void)prepare
 {
     [super prepare];
     
-#if __IPHONE_OS_VERSION_MAX_ALLOWED > 130000
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000
     if (@available(iOS 13.0, *)) {
         _activityIndicatorViewStyle = UIActivityIndicatorViewStyleMedium;
         return;