Avoid modifying the PATH for the python test suites #1450

Job	Run time
Compile the UX-less version of the app on Nano S+ for performance tests	1m 31s
Compilation for X, S+, Stax and Flex (nanox, $NANOX_SDK)	1m 53s
Compilation for X, S+, Stax and Flex (nanosp, $NANOSP_SDK)	1m 51s
Compilation for X, S+, Stax and Flex (stax, $STAX_SDK)	1m 59s
Compilation for X, S+, Stax and Flex (flex, $FLEX_SDK)	2m 2s
Performance report	25s
Tests with the JS library	1m 23s
Tests on mainnet (nanox)	19s
Tests on mainnet (nanosp)	13s
Tests with the Python library and legacy Bitcoin app	23s
Tests on mainnet (stax)	18s
Tests for rust client library	1m 37s
Tests on mainnet (flex)	20s
Unit test	1m 27s
	15m 41s

Provide feedback