Fix the number of characters in the test

Oops in a8682f7

Author: AlexDaniel

t/nqp/063-slurp.t

@@ -1,6 +1,6 @@
 plan(1);
 
 my $content := slurp("t/nqp/063-slurp.t");
-ok(nqp::chars($content) == 158 || nqp::chars($content) == 166, "File slurped");
+ok(nqp::chars($content) == 150 || nqp::chars($content) == 156, "File slurped");
 
 # vim: ft=perl6