egl/haiku: drop overwritten preset of EGL version

Merged Eric Engestrom requested to merge eric/mesa:haiku-drop-egl-version-preset into master

init_haiku() is called by eglInitialize(), which then calls _eglComputeVersion() (without even anything in between). The latter sets the EGL version based on the extensions supported, and since Haiku doesn't support any it will end up overwriting the same 1.4 value.

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