When resuming curses, call getch() (10ms timeout) to clear the input buffer.

Prevents arrow-key weirdness in SyncTERM (and presumably others).

src/conio/curs_cio.c

@@ -654,6 +654,7 @@ void curs_resume(void)
 	raw();
 	timeout(10);
 	refresh();
+	getch();
 }
 
 int curs_initciolib(long inmode)