Fix Check_Internet domain

[YonLiud]

critical fix: 🚑 Fix Check_Internet

Replace example.com with official BlackArch's URL blackarch.org on line 64

This fixes Issue #153

-   if ! $tool $tool_opts https://example.com/ > /dev/null 2>&1; then
+   if ! $tool $tool_opts https://blackarch.org/ > /dev/null 2>&1; then

The issue has existed for a long time and is CRITICAL for new beginners in BlackArch.

If this was meant to be a "CTF" please reference it as a comment in the file in order to not cause confusion among other comrades

-Yon Liud :)