Address MSVC warning: conversion from 'double' to 'unsigned int'

... possible loss of data (yeah, yeah, we know)

src/sbbs3/scfglib1.c

@@ -123,7 +123,7 @@ BOOL read_main_cfg(scfg_t* cfg, char* error, size_t maxerrlen)
 	cfg->max_log_size = (uint32_t)iniGetBytes(ini, ROOT_SECTION, "max_log_size", 1, 0);
 	cfg->max_logs_kept = iniGetUInt16(ini, ROOT_SECTION, "max_logs_kept", 0);
 	cfg->ctrlkey_passthru = iniGetInteger(ini, ROOT_SECTION, "ctrlkey_passthru", 0);
-	cfg->max_getkey_inactivity = iniGetDuration(ini, ROOT_SECTION, "max_getkey_inactivity", 300);
+	cfg->max_getkey_inactivity = (uint)iniGetDuration(ini, ROOT_SECTION, "max_getkey_inactivity", 300);
 	cfg->inactivity_warn = (uchar)iniGetShortInt(ini, ROOT_SECTION, "inactivity_warn", 75);
 
 	cfg->user_backup_level = iniGetInteger(ini, ROOT_SECTION, "user_backup_level", 5);