tests: remove IPA_PROXY_PATH environment variable

The tests declare a hard-coded LIBCAMERA_IPA_PROXY_PATH to allow tests
to run from tests-suite.

Now that the proxy path is determined at runtime, we can remove the
redundant setting of LIBCAMERA_IPA_PROXY_PATH for tests.

Signed-off-by: Kaaira Gupta <kgupta@es.iitr.ac.in>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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