fix(css): ie-only fixes updated

@media screen\0 should not be in the `layout-attributes.scss`; these
are already contained in `ie_fixes.css`.

Fixes #6304.

Author: ThomasBurleson

src/core/services/layout/layout-attributes.scss

@@ -136,19 +136,6 @@ $layout-breakpoint-lg:     1920px !default;
 
   [#{$flexName}]             { flex: 1;         box-sizing: border-box; }  // === flex: 1 1 0%;
 
-  // IE mediaQuery hack for 8,9,10 to set the flex-basis properly for 'flex' values
-  // Details:
-  // Do not use unitless flex-basis values in the flex shorthand because IE 10-11 will error.
-  // Also use 0% instead of 0px since minifiers will often convert 0px to 0 (which is unitless and will have the same problem).
-  // Safari, however, fails with flex-basis : 0% and requires flex-basis : 0px
-  @if $name != '-print' { 
-    @media screen\0 {
-        [#{$flexName}] {
-          flex: 1 1 0%;
-        }
-    }
-  }
-
   [#{$flexName}-grow]        { flex: 1 1 100%;  box-sizing: border-box; }
   [#{$flexName}-initial]     { flex: 0 1 auto;  box-sizing: border-box; }
   [#{$flexName}-auto]        { flex: 1 1 auto;  box-sizing: border-box; }