dev-python/pyproject-fmt-rust: Run cargo_src_test in python_test_all

Run Cargo tests in python_test_all phase, to ensure that it uses one
of the Python implementation in PYTHON_COMPAT.  That said, the tests
don't seem to really use Python, so we don't need to run them multiple
times.

Signed-off-by: Michał Górny <mgorny@gentoo.org>

dev-python/pyproject-fmt-rust/pyproject-fmt-rust-1.0.4.ebuild

@@ -154,7 +154,6 @@ src_prepare() {
 	distutils-r1_src_prepare
 }
 
-src_test() {
+python_test_all() {
 	cargo_src_test
-	distutils-r1_src_test
 }