fix: use @font-family

Author: aminya

styles/atom-ide-datatips.less

@@ -8,7 +8,7 @@
   pointer-events: all; // hyperlinks will work
   // user-select: text;   // allow selecting text // TODO does not work
 
-  font-family: var(--editor-font-family);
+  font-family: @font-family;
   font-size: var(--editor-font-size);
 
   max-height: 500px;