Fix PythonTest_*.clean targets

Change-Id: If8d0b89810c7c9a0cf8664e5f34be154e35e40ed
Reviewed-on: https://gerrit.libreoffice.org/52071Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

solenv/gbuild/PythonTest.mk

@@ -26,7 +26,7 @@ gb_PythonTest_COMMAND := $(gb_PythonTest_EXECUTABLE) -m unittest
 .PHONY : $(call gb_PythonTest_get_clean_target,%)
 $(call gb_PythonTest_get_clean_target,%) :
 	$(call gb_Helper_abbreviate_dirs,\
-		rm -f $@ $@.log)
+		rm -fr $(WORKDIR)/PythonTest/$*)
 
 ifneq ($(DISABLE_PYTHON),TRUE)