Fix some minor bugs with setting the user timezone.

modules/nickserv/ns_set_timezone.cpp

@@ -105,6 +105,8 @@ public:
 			}
 
 			usertz = timezone;
+			if (usertz.equals_ci(param))
+				break; // Exact match.
 		}
 
 		if (usertz.empty())

src/misc.cpp

@@ -634,6 +634,7 @@ Anope::string Anope::strftime(time_t t, const NickCore *nc, bool short_output)
 	if (nc)
 	{
 		unsetenv("TZ");
+		tzset();
 		Language::ResetLocale();
 	}