Clipboard: fix text always getting cleared to null in __update() when targeting html5

src/lime/system/Clipboard.hx

@@ -53,6 +53,8 @@ class Clipboard
 		{
 			_text = FlashClipboard.generalClipboard.getData(TEXT_FORMAT);
 		}
+		#elseif (js || html5)
+		_text = cacheText;
 		#end
 		__updated = true;