Fix wrong variable name in activate.sh
Fix wrong variable name in activate.sh

markreidvfx/PyAV,xxr3376/PyAV,pupil-labs/PyAV,pupil-labs/PyAV,markreidvfx/PyAV,pupil-labs/PyAV,mikeboers/PyAV,mikeboers/PyAV,mcpv/PyAV,mcpv/PyAV,pupil-labs/PyAV,PyAV-Org/PyAV,markreidvfx/PyAV,mcpv/PyAV,xxr3376/PyAV,xxr3376/PyAV,PyAV-Org/PyAV