Percentage text is visible for indeterminate circular progress bar

## Description  
Percentage text is visible for indeterminate circular progress bar.

 * igniteui-angular version: 9.0.x
 * browser: NA

## Steps to reproduce  

1. Open Hierarchical Grid Remote dev demo.
2. Look at the loading indicator.

## Result  
There is '0%' text inside the indicator.

## Expected result  
There should be no text inside the loading indicator.