Fix reading and writing of hotkey: sections in xtrn.ini

Section suffix is the decimal ASCII value, not the character itself.
Fix issue #440 as reported by Nelgin

src/sbbs3/scfglib2.c

@@ -581,7 +581,7 @@ BOOL read_xtrn_cfg(scfg_t* cfg, char* error, size_t maxerrlen)
 			return allocerr(error, maxerrlen, fname, "hotkey", sizeof(hotkey_t));
 		memset(cfg->hotkey[i],0,sizeof(hotkey_t));
 
-		cfg->hotkey[i]->key = list[i][7];
+		cfg->hotkey[i]->key = atoi(list[i] + 7);
 		SAFECOPY(cfg->hotkey[i]->cmd, iniGetString(ini, section, "cmd", "", value));
 	}
 	iniFreeStringList(list);

src/sbbs3/scfgsave.c

@@ -923,7 +923,7 @@ BOOL write_xtrn_cfg(scfg_t* cfg, int backup_level)
 	}
 
 	for(uint i=0; i<cfg->total_hotkeys; i++) {
-		SAFEPRINTF(name, "hotkey:%c", cfg->hotkey[i]->key);
+		SAFEPRINTF(name, "hotkey:%u", cfg->hotkey[i]->key);
 		iniSetString(&ini, name, "cmd", cfg->hotkey[i]->cmd, NULL);
 	}