fix: revert a bug that the height of the column is broken when displayed in IE11 (bigcalendar#1789)" (bigcalendar#1805)

This reverts commit a0538ee.

Author: jason-codaio

src/sass/time-column.scss

@@ -5,8 +5,6 @@
   flex-direction: column;
   min-height: 100%;
 
-  height: 100%; // ie-fix
-
   .rbc-timeslot-group {
     flex: 1;
   }