Remove $sep variable duplication from Ternary Operator

[joelcj91]

In WP_List_Table class, we are using ternary operators a lot. We know that the main advantage of the ternary operator is, it makes code shorter.

Instead of uisng ternary operator like this,

( $i == $action_count ) ? $sep = '' : $sep = ' | ';

Can we use,

$sep = ( $i == $action_count ) ? '' : ' | ';

So the variable $sep is written once. Shortening the code a bit.

Patch to remove variable duplication