fix size of activity indicator for TTActivityLabelStyle{BlackBezel,Bl…

…ackBox]

this came up in iOS 5. Probably setting the size of the activityIndicator to 24x24 fixed this before
fixes #715

src/Three20UI/Sources/TTActivityLabel.m

@@ -113,7 +113,7 @@ - (id)initWithFrame:(CGRect)frame style:(TTActivityLabelStyle)style text:(NSStri
 
     } else if (_style == TTActivityLabelStyleBlackBezel || _style == TTActivityLabelStyleBlackBox) {
       _activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:
-                                                            UIActivityIndicatorViewStyleWhiteLarge];
+                                                            UIActivityIndicatorViewStyleWhite];
       _activityIndicator.frame = CGRectMake(0, 0, 24, 24);
       _label.font = TTSTYLEVAR(activityLabelFont);
       _label.textColor = [UIColor whiteColor];