src/area.c: Disable RLE on area layers.

This mostly fixes the performance regression introduced by merging the
palette cycling and map movement demos.

I removed the 10-ms delay between frames in the demo and tested the
framerates:

    Test  Framerate with RLE (fps)  Framerate without RLE (fps)
    1      160.306202859            1730.255164034
    2      142.599639495            1758.024691358
    3      167.588560668            1797.97979798
    4      162.279202279            1764.560099133
    5      157.278550917            1625.570776256
    avg    158.010431244            1735.278105752

I then restored the delay and watched the CPU usage:

    CPU usage with RLE  CPU usage without RLE
    ~9.00%              ~1.00%

This is happening because we're now cycling palettes each frame and, as
a result, SDL needs to decode and encode the surfaces each frame to map
palettes (though I'm not sure why it needs a decoded surface just to map
palettes).

(Normally, we probably wouldn't cycle palettes /each frame/, so this is
something of an extreme case.)

See for example the SDL_UnRLESurface() call at line 551 of
src/video/SDL_pixels.c in SDL 1.2.15.

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