Suppress flexbox side effects in breadcrumb (twbs#31700)

* Suppress flexbox side effects

* Trailing whitesapce

Co-authored-by: Mark Otto <markd.otto@gmail.com>
Co-authored-by: XhmikosR <xhmikosr@gmail.com>

scss/_breadcrumb.scss

@@ -10,14 +10,12 @@
 }
 
 .breadcrumb-item {
-  display: flex;
-
   // The separator between breadcrumbs (by default, a forward-slash: "/")
   + .breadcrumb-item {
     padding-left: $breadcrumb-item-padding-x;
 
     &::before {
-      display: inline-block; // Suppress underlining of the separator
+      float: left; // Suppress inline spacings and underlining of the separator
       padding-right: $breadcrumb-item-padding-x;
       color: $breadcrumb-divider-color;
       content: escape-svg($breadcrumb-divider);