Fix inconsistencies with buffer sizes for player names.

Found any I could not using MAX_NAME_LENGTH and changed them to use it. I think that we should
increase MAX_NAME_LENGTH to 128 for CS:GO at some point as that's what it uses internally.
(Presumably to get the client's full multibyte name from Steam without truncation mid-codepoint which
can happen in other games. Steam's max is 32 characters if I remember correctly, but allows multibyte chars).

plugins/basebans/ban.sp

@@ -49,7 +49,7 @@ PrepareBan(client, target, time, const String:reason[])
 		return;
 	}
 
-	new String:name[32];
+	new String:name[MAX_NAME_LENGTH];
 	GetClientName(target, name, sizeof(name));
 
 	if (!time)