Resetting changes, to be only in ionic theme

Author: rugoncalves

core/src/components/tab-bar/tab-bar.common.scss

@@ -7,6 +7,7 @@
   display: flex;
 
   align-items: center;
+  justify-content: center;
 
   border-top: var(--border);
 
@@ -19,8 +20,6 @@
 
   /* stylelint-disable-next-line declaration-no-important */
   box-sizing: content-box !important;
-
-  overflow: auto;
 }
 
 :host(.ion-color) ::slotted(ion-tab-button.ion-focused),