【feature】刷新时 pageControl 重置， pageControl 刷新时 重叠显示的bug

【影响范围】 轮播 pageControl显示
【风险评估】低
【是否自测】是

DZXCarouselView/Classes/DZXCarouselView.m

@@ -392,6 +392,10 @@ static BOOL isScrolling = NO;
     for (UIView* subView in self.scrollView.subviews) {
         [subView removeFromSuperview];
     }
+    if (self.pageControl) {
+        [self.pageControl removeFromSuperview];
+        self.pageControl = nil;
+    }
     self.nextV=nil;
     self.currentV=nil;
     self.lastV=nil;