Remove -iWF as an option in SyncTERM

Full-screen console doesn't scale anymore on modern Windows, so this
flag is worse than useless.

src/syncterm/syncterm.c

@@ -102,7 +102,7 @@ char *usage =
     "       I = Curses mode with forced ASCII charset\n"
     "       F = Curses mode with forced IBM charset\n"
 #else
-    "       W[F] = Win32 console (text) mode, F for fullscreen\n"
+    "       W = Win32 console (text) mode\n"
     "       G = Win32 GDI (graphics) mode\n"
 #endif
     "       A = ANSI mode\n"
@@ -1619,11 +1619,6 @@ main(int argc, char **argv)
 							break;
 						case 'W':
 							ciolib_mode = CIOLIB_MODE_CONIO;
-							switch (toupper(argv[i][3])) {
-								case 'F':
-									ciolib_mode = CIOLIB_MODE_CONIO_FULLSCREEN;
-									break;
-							}
 							break;
 						case 'S':
 							switch (toupper(argv[i][3])) {