Fix-ups for the "continuous random tone" sysop chat pager

I haven't played with this chat pager in *years*! The lowest tones were inaudible (raise the range from 0-800Hz to 400-1200Hz).
Increase the msgabort() tone from 1 to 10ms, sounds like those computerized voice recognition phone systems now.

Remove the redundant "<user> paged you to chat" notifications (and log message) when turning *off* the chat pager.

src/sbbs3/chat.cpp

@@ -691,11 +691,12 @@ bool sbbs_t::sysop_page(void)
 		|| (cfg.sys_chat_ar[0] && chk_ar(cfg.sys_chat_ar,&useron,&client))
 		|| useron.exempt&FLAG('C')) {
 
+		if(!(sys_status&SS_SYSPAGE)) {
 			logline("C", "paged sysop for chat");
 			sprintf(str, "%s paged you to chat", useron.alias);
 			notify(&cfg, 1, str, NULL);
-
 			ftouch(syspage_semfile);
+		}
 		for(i=0;i<cfg.total_pages;i++)
 			if(chk_ar(cfg.page[i]->ar,&useron,&client))
 				break;

src/sbbs3/con_out.cpp

@@ -1355,7 +1355,7 @@ bool sbbs_t::msgabort(bool clear)
 	static ulong counter;
 
 	if(sys_status&SS_SYSPAGE && !(++counter%100))
-		sbbs_beep(sbbs_random(800),1);
+		sbbs_beep(400 + sbbs_random(800), 10);
 
 	if(sys_status&SS_ABORT) {
 		if(clear)

src/sbbs3/inkey.cpp

@@ -89,9 +89,10 @@ int sbbs_t::inkey(long mode, unsigned long timeout)
 
 	ch=kbincom(this,timeout);
 
-	if(ch == NOINP) {
 	if(sys_status&SS_SYSPAGE) 
-			sbbs_beep(sbbs_random(800),100);
+		sbbs_beep(400 + sbbs_random(800), ch == NOINP ? 100 : 10);
+
+	if(ch == NOINP) {
 		if(mode & K_NUL)	// distinguish between timeout and '\0'
 			return NOINP;
 		return 0;