fix(grid): invalid cell icon

Author: adrianptrv

projects/igniteui-angular/src/lib/core/styles/components/grid/_grid-theme.scss

@@ -1783,7 +1783,7 @@
         padding-inline-end: rem(4px) !important;
 
         > igx-icon {
-            margin-inline-start: auto;
+            margin-inline-start: rem(2px);
             color: color($color: 'error');
             width: var(--igx-icon-size, rem(18px));
             height: var(--igx-icon-size, rem(18px));