[Checkbox] Fixed checkmark icon not updating color on error correctly…

… in pre 21.

Issue happened on checkboxes that switched from unchecked to checked and later to be on error state.

Fixes #3302

PiperOrigin-RevId: 520088272

lib/java/com/google/android/material/checkbox/MaterialCheckBox.java

@@ -471,6 +471,10 @@ public void setErrorShown(boolean errorShown) {
     }
     this.errorShown = errorShown;
     refreshDrawableState();
+    // This is needed due to a pre-21 bug where the drawable states don't get updated correctly.
+    if (VERSION.SDK_INT < VERSION_CODES.LOLLIPOP && buttonIconDrawable != null) {
+      buttonIconDrawable.jumpToCurrentState();
+    }
     for (OnErrorChangedListener listener : onErrorChangedListeners) {
       listener.onErrorChanged(this, this.errorShown);
     }