Revert "fix(material/radio): hidden circle visible on some zoom levels (#23154)"

This reverts commit 21bb4d5.

Author: wagnermaciel

src/material/radio/radio.scss

@@ -67,20 +67,14 @@ $ripple-radius: 20px;
 
 // The inner circle for the radio, shown when checked.
 .mat-radio-inner-circle {
-  $transition-duration: 280ms;
-  $base-transition: transform ease $transition-duration, background-color ease $transition-duration;
   border-radius: 50%;
   box-sizing: border-box;
   display: block;
   height: $size;
   left: 0;
   position: absolute;
   top: 0;
-  // On some zoom levels the `scale(0.001)` from below can cause the circle to be shown as a 1x1
-  // dot (see #22036). Ensure that it's hidden using `opacity`. There's a slight transition with
-  // a long delay so that switching the opacity only applies after the `transform` is done.
-  opacity: 0;
-  transition: $base-transition, opacity linear 1ms $transition-duration;
+  transition: transform ease 280ms, background-color ease 280ms;
   width: $size;
 
   // Note: This starts from 0.001 instead of 0, because transitioning from 0 to 0.5 causes
@@ -90,21 +84,19 @@ $ripple-radius: 20px;
   // force browser to show background-color when using the print function
   @include vendor-prefixes.private-color-adjust(exact);
 
+  ._mat-animation-noopable & {
+    transition: none;
+  }
+
   .mat-radio-checked & {
     transform: scale(0.5);
-    opacity: 1;
-    transition: $base-transition;
 
     @include a11y.high-contrast(active, off) {
       // Since we use a background color to render the circle, it won't be
       // displayed in high contrast mode. Use a border as a fallback.
       border: solid private.private-div($size, 2);
     }
   }
-
-  ._mat-animation-noopable & {
-    transition: none;
-  }
 }
 
 // Text label next to radio.