Modals: fix modal not on top of everything

bin/common.less

@@ -7,7 +7,7 @@
 @domkit-layer: 400;
 @popup-layer: 800;
 @header-layer: 600;
-@hidemodal-layer: 700;
+@hidemodal-layer: 999;
 
 // This is also set in hide.comp.ContextMenu
 @contextmenu-layer: 900;

bin/style.css

@@ -405,7 +405,7 @@ input[type=checkbox].indeterminate:after {
   left: 0px;
   width: 100%;
   height: 100%;
-  z-index: 700;
+  z-index: 999;
   background-color: rgba(0, 0, 0, 0.2);
   display: table;
 }

bin/style.less

@@ -441,7 +441,7 @@ input[type=checkbox] {
 	left:0px;
 	width: 100%;
 	height: 100%;
-	z-index: @hidemodal-layer;
+	z-index: 999;
 	background-color: rgba(0,0,0,0.2);
 	display: table;
 	&> .content {