tests: Use native meson exec wrapper in test setups instead of our script

No need to provide a script that will break usage of `meson test --gdb`
when we can use a native and cleaner alternative.

We can then ignore LIBFPRINT_TEST_WRAPPER in basic tests, while it is
still needed by umockdev tests.

tests/virtual-image.py

@@ -21,14 +21,6 @@ except Exception as e:
 
 FPrint = None
 
-# Re-run the test with the passed wrapper if set
-wrapper = os.getenv('LIBFPRINT_TEST_WRAPPER')
-if wrapper:
-    wrap_cmd = wrapper.split(' ') + [sys.executable, os.path.abspath(__file__)] + \
-        sys.argv[1:]
-    os.unsetenv('LIBFPRINT_TEST_WRAPPER')
-    sys.exit(subprocess.check_call(wrap_cmd))
-
 def load_image(img):
     png = cairo.ImageSurface.create_from_png(img)