Fix resolver not formatting properly when selector has a closing parenthesis

[chinleung]

I'm trying to do something like this:

$browser->assertSeeIn('@products div:nth-child(2 of @product)', '...');

The selector resolves into a broken selector where the closing parenthesis from @product) is included in the dusk attribute because the current pattern is @(\S+).

body [dusk="products"] div:nth-child(2 of [dusk="product)"]

With the new pattern @([^\s\)]+), we get a fully functional selector:

body [dusk="products"] div:nth-child(2 of [dusk="product"])