fix: App center - Application help icon is mis-placed - EXO-71815 - M…

…eeds-io/meeds#2035. (#778)

Before this change, when,add a hlep url on any app & save and display
app center and check? icon displayed, the icon ? location is wrong.
After this change, the ? icon is on the bottom of the card next to the
bookmark icon on the left.

platform-ui-skin/src/main/webapp/skin/less/variables.less

@@ -74,6 +74,7 @@
 @greyColorLighten1Default: #707070;
 @greyColorLighten1: var(--allPagesGreyColorLighten1, @greyColorLighten1Default);
 @greyColorLighten1Opacity1: var(--allPagesGreyColorLighten1Opacity1, fade(@greyColorLighten1Default, 13%));
+@greyColorLighten2: var(--allPagesGreyColorLighten1, @mediumGrey);
 @greyColorLighten1Opacity2: var(--allPagesGreyColorLighten1Opacity2, fade(@greyColorLighten1Default, 8%));
 @greyColorOpacity1: var(--allPagesGreyColorOpacity1, fade(@greyColorDefault, 35%));
 @greyColorOpacity2: var(--allPagesGreyColorOpacity2, fade(@baseColorDefault, 12%));