Enable mouse support by default.

diff -u -r ../weechat-1.2/src/core/wee-config.c ./src/core/wee-config.c
--- ../weechat-1.2/src/core/wee-config.c	2015-05-10 03:24:50.000000000 -0400
+++ ./src/core/wee-config.c	2015-08-12 00:20:55.006420493 -0400
@@ -2619,7 +2619,7 @@
         weechat_config_file, ptr_section,
         "mouse", "boolean",
         N_("enable mouse support"),
-        NULL, 0, 0, "off", NULL, 0, NULL, NULL, &config_change_mouse, NULL, NULL, NULL);
+        NULL, 0, 0, "on", NULL, 0, NULL, NULL, &config_change_mouse, NULL, NULL, NULL);
     config_look_mouse_timer_delay = config_file_new_option (
         weechat_config_file, ptr_section,
         "mouse_timer_delay", "integer",