[jQuery] jQuery 1.3.2 breaks tablesorter zebra, here's a fix

[MorningZ]

So the new jQuery code for the filter ":visible" breaks the
tablesorter's built in Zebra functionality... kind of a hacky fix, but
at least it works with a minor change

at the end if the tablesorter.js file is the addWidget code for zebra,
change

$("tr:visible", table.tBodies[0]).each(function(i) {
     // existing code inside this loop
});

to

$("tr", table.tBodies[0]).each(function(i) {
     if ($.css(this, "display") !== "none" && $.css(this,
"visibility") !== "hidden") {
             // existing code inside this loop
     }
});

so pretty much took the selector code from 1.3 and used that inside of
":visible", not sure if that's the best fix ever, but it does make the
widget act as it's supposed to