Remove box-shadow from ToggleSwitch knob to match primer/react

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: dylanatsmith

app/components/primer/alpha/toggle_switch.pcss

@@ -113,7 +113,6 @@
 
   & .ToggleSwitch-knob {
     border-color: var(--borderColor-default);
-    box-shadow: none;
   }
 
   & .ToggleSwitch-lineIcon {
@@ -168,7 +167,6 @@
   /* Use calc to account for the 1px border around the track */
   /* stylelint-disable-next-line primer/borders */
   border-radius: calc(var(--borderRadius-medium) - var(--borderWidth-thick));
-  box-shadow: var(--shadow-resting-medium), var(--button-default-shadow-inset);
   transition-timing-function: cubic-bezier(0.5, 1, 0.89, 1);
   transition-duration: 80ms;
   transition-property: transform;