GTK3: use the same shadows for the switch, check, radio, switch and entry widgets

src/themes/Kali/sass/gtk-sass/_common-tweaks.scss

@@ -67,7 +67,7 @@ headerbar entry {
 switch {
   $_slider_border_color: darken($alt_borders_color, 3%);
 
-  box-shadow: inset 0 1px 2px -1px transparentize(black, if($variant=='light', .8, .4));
+  box-shadow: $_widget_inset_shadow;
 
   &:checked {
     border-color: transparentize(black, .8);
@@ -117,7 +117,7 @@ radio {
   &, menu menuitem &, menu menuitem:hover & {
     background-image: linear-gradient(to bottom, $_c 20%, darken($_c, 2%) 90%);
     border-color: $alt_borders_color;
-    box-shadow: $_shadow;
+    box-shadow: $_widget_inset_shadow;
 
     &:disabled, &:disabled:backdrop {
       &, &:checked, &:indeterminate {