Fix breakpoint lineheight (#5889)

Author: darkwing

src/components/SecondaryPanes/Breakpoints.css

@@ -19,7 +19,6 @@
 .breakpoints-list .breakpoint {
   font-size: 12px;
   color: var(--theme-content-color1);
-  line-height: 1em;
   position: relative;
   transition: all 0.25s ease;
   padding: 0.5em 1em 0.5em 0.5em;