wolf3d: increase default viewport size

Makes things a little bigger by default (but not maximized).

Change-Id: I9e4ae725e22458f1e5140a560ff242159ef582d7

apps/plugins/sdl/progs/wolf3d/wl_main.c

@@ -212,7 +212,7 @@ noconfig:
         if (IN_JoyPresent())
             joystickenabled = true;
 
-        viewsize = 19;                          // start with a good size
+        viewsize = 20;                          // start with a good size
         mouseadjustment=5;
     }