Fixes #3705 - Issue with normalize.css reset resetting some elements to content-box box sizing

src/themes/default/globals/reset.overrides

@@ -216,8 +216,6 @@ figure {
  */
 
 hr {
-  -moz-box-sizing: content-box;
-  box-sizing: content-box;
   height: 0;
 }
 
@@ -363,9 +361,6 @@ input[type="number"]::-webkit-outer-spin-button {
 
 input[type="search"] {
   -webkit-appearance: textfield; /* 1 */
-  -moz-box-sizing: content-box;
-  -webkit-box-sizing: content-box; /* 2 */
-  box-sizing: content-box;
 }
 
 /**
@@ -431,4 +426,4 @@ table {
 td,
 th {
   padding: 0;
-}
+}