Tiling: tile windows with "Static" gravity.

I can't find anything in the specs that would imply those shouldn't be
tiled. This may cause placement bugs, but I don't think that'd be the
case, as we ignore application placement when tiling anyway.

@fix

src/modules/tiling/e_mod_tiling.c

@@ -182,11 +182,6 @@ is_tilable(const E_Client *ec)
    if (ec->icccm.min_h == ec->icccm.max_h && ec->icccm.max_h > 0)
      return false;
 
-#ifndef HAVE_WAYLAND_ONLY
-   if (ec->icccm.gravity == ECORE_X_GRAVITY_STATIC)
-     return false;
-#endif
-
    if (ec->e.state.centered || e_win_centered_get(ec->internal_elm_win))
      return false;