Ionic input has always a shape, so we don't need a default var value for border-radius;

Author: JoaoFerreira-FrontEnd

core/src/components/input/input.ionic.scss

@@ -8,7 +8,6 @@
 :host {
   --color: #{globals.$ion-primitives-neutral-1200};
   --border-width: #{globals.$ion-border-size-025};
-  --border-radius: #{globals.$ion-border-radius-100};
   --highlight-color-valid: #{globals.$ion-semantics-success-900};
   --highlight-color-invalid: #{globals.$ion-border-danger-default};
   --placeholder-color: #{globals.$ion-primitives-neutral-800};