Fixed test 11_exp_to_xpath.t

Fixed 11_exp_to_xpath.t - respecting changes in HTML-Selector-XPath between 0.16 and 0.17
-                push @parts, "[contains(concat(' ', \@class, ' '), ' $name ')]";
+                push @parts, "[contains(concat(' ', normalize-space(\@class), ' '), ' $name ')]";

see https://metacpan.org/diff/file?target=CORION/HTML-Selector-XPath-0.17/lib/HTML/Selector/XPath.pm&source=CORION/HTML-Selector-XPath-0.16/lib/HTML/Selector/XPath.pm