Fixed buffer size for workshop map.

[TheByKotik]

I noticed on my CS:GO server that voting to change the map does not change it.
After reviewing the logs carefully, I realized that not full the mapname is taken.
Sorry for "my russian english".
Below is a log before and after this changes.

----------------Before:
L 02/03/2019 - 14:34:22: -------- Mapchange to workshop/524648589/mg_sonic_islands_v3_w --------
L 02/03/2019 - 14:34:53: [basevotes.smx] "Ҝℴţأķ<2><STEAM_1:1:58422681><>" initiated a map vote.
L 02/03/2019 - 14:34:54: [basevotes.smx] Changing map to workshop/141714364/mg_saw_rfix_ due to vote.
L 02/03/2019 - 14:34:59: [SM] Changed map to "workshop/141714364/mg_saw_rfix_"
-----------------------------------------------------↑ Not full mapname.
L 02/03/2019 - 14:35:18: SourceMod log file session started (file "/home/csgo/serverfiles/csgo/addons/sourcemod-test/logs/L20190203.log") (Version "1.10.0.6377")
L 02/03/2019 - 14:35:18: -------- Mapchange to workshop/524648589/mg_sonic_islands_v3_w --------
----------------After:
L 02/03/2019 - 14:44:20: -------- Mapchange to workshop/524648589/mg_sonic_islands_v3_w --------
L 02/03/2019 - 14:44:33: [basecommands.smx] "Ҝℴţأķ<2><STEAM_1:1:58422681><>" changed map to "workshop/524648589/mg_sonic_islands_v3_w"
L 02/03/2019 - 14:44:36: [SM] Changed map to "workshop/524648589/mg_sonic_islands_v3_w"
L 02/03/2019 - 14:44:37: -------- Mapchange to workshop/524648589/mg_sonic_islands_v3_w --------
L 02/03/2019 - 14:44:55: [basevotes.smx] "Ҝℴţأķ<2><STEAM_1:1:58422681><>" initiated a map vote.
L 02/03/2019 - 14:44:56: [basevotes.smx] Changing map to workshop/141714364/mg_saw_rfix_64v_csgo due to vote.
L 02/03/2019 - 14:45:01: [SM] Changed map to "workshop/141714364/mg_saw_rfix_64v_csgo"
-----------------------------------------------------↑ Full mapname.
L 02/03/2019 - 14:45:02: -------- Mapchange to workshop/141714364/mg_saw_rfix_64v_csgo --------
L 02/03/2019 - 14:47:10: Log file closed.

[KyleSanderson]

Thank you very much