You can do this with DOM manipulation (which is discouraged, but since you're currently using it in your script I imagine it's not an issue for you):

var firstPencilIcon = this.document.querySelector("a.fa.fa-pencil");
if(firstPencilIcon) firstPencilIcon.remove();

First, select the pencil-icon on the page with querySelector (this selects the first match, hence the one from the first row), and then delete it with remove. I've added an if-statement to do a check to ensure the element exists before it's removed to avoid potential errors.

You can check the browser support for these methods here:

• querySelector: https://caniuse.com/queryselector
• remove: https://caniuse.com/mdn-api_element_remove