refactor(themes): remove duplicated --ion-dynamic-font

Author: brandyscarney

core/src/css/core.scss

@@ -12,10 +12,6 @@ html.ios {
   --ion-font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Roboto", sans-serif;
 }
 
-html {
-  --ion-dynamic-font: -apple-system-body;
-}
-
 body {
   background: var(--ion-background-color);
   color: var(--ion-text-color);