Elastic: Make @color-list-deleted the same as disabled buttons, etc.

i.e. semi-transparent @font-color

skins/elastic/styles/colors.less

@@ -77,7 +77,7 @@
 @color-list-selected:               @color-font;
 @color-list-selected-background:    tint(@color-main, 90%);
 @color-list-flagged:                @color-error;
-@color-list-deleted:                lighten(@color-black, 50%);
+@color-list-deleted:                fadeout(@color-font, 50%);
 @color-list-secondary:              @color-black-shade-text;
 @color-list-droptarget-background:  #ffffcc;
 @color-list-focus-indicator:        lighten(@color-main, 20%);