fix(pagination): remove CSS variables (#1457)

Signed-off-by: Isabelle Chanclou <isabelle.chanclou@orange.com>

scss/_pagination.scss

@@ -4,7 +4,6 @@
   --#{$prefix}pagination-padding-y: #{$pagination-padding-y};
   --#{$prefix}pagination-padding-end: #{$pagination-padding-end}; // Boosted mod
   --#{$prefix}pagination-margin-y: #{$pagination-margin-y}; // Boosted mod
-  --#{$prefix}pagination-margin-start: #{$pagination-margin-start}; // Boosted mod
   --#{$prefix}pagination-margin-x-first-last: #{$pagination-margin-x-first-last}; // Boosted mod
   @include rfs($pagination-font-size, --#{$prefix}pagination-font-size);
   --#{$prefix}pagination-font-weight: #{$font-weight-bold}; // Boosted mod
@@ -19,7 +18,6 @@
   --#{$prefix}pagination-focus-color: #{$pagination-focus-color};
   --#{$prefix}pagination-focus-bg: #{$pagination-focus-bg};
   --#{$prefix}pagination-focus-box-shadow: #{$pagination-focus-box-shadow};
-  --#{$prefix}pagination-focus-outline: #{$pagination-focus-outline}; // Boosted mod
   --#{$prefix}pagination-active-color: #{$pagination-active-color};
   --#{$prefix}pagination-active-bg: #{$pagination-active-bg};
   --#{$prefix}pagination-active-border-color: #{$pagination-active-border-color};
@@ -77,7 +75,7 @@
     color: var(--#{$prefix}pagination-focus-color);
     background-color: var(--#{$prefix}pagination-focus-bg);
     border-color: var(--#{$prefix}pagination-hover-border-color); // Boosted mod
-    outline: var(--#{$prefix}pagination-focus-outline); // Boosted mod
+    outline: $pagination-focus-outline;
     box-shadow: var(--#{$prefix}pagination-focus-box-shadow);
   }
 
@@ -111,7 +109,7 @@
 
 .page-item {
   &:not(:first-child) .page-link {
-    margin-left: var(--#{$prefix}pagination-margin-start); // Boosted mod
+    margin-left: $pagination-margin-start;
   }
 
   @if $pagination-margin-start == ($pagination-border-width * -1) {