refactor(progress-bar): set default value=0

Author: xidedix

projects/coreui-angular/src/lib/progress/progress-bar.directive.ts

@@ -64,7 +64,7 @@ export class ProgressBarDirective {
    * @return number
    * @default 0
    */
-  readonly value = input(undefined, { transform: numberAttribute });
+  readonly value = input(0, { transform: numberAttribute });
 
   /**
    * Set the progress bar variant to optional striped.