cmake: fix unable to start confserver on windows

tools/cmake/kconfig.cmake

@@ -146,7 +146,7 @@ function(kconfig_process_config)
         COMMAND ${CMAKE_COMMAND} -E env
         "COMPONENT_KCONFIGS=${kconfigs}"
         "COMPONENT_KCONFIGS_PROJBUILD=${kconfigs_projbuild}"
-        ${IDF_PATH}/tools/kconfig_new/confserver.py --kconfig ${IDF_PATH}/Kconfig --config ${SDKCONFIG}
+        ${PYTHON} ${IDF_PATH}/tools/kconfig_new/confserver.py --kconfig ${IDF_PATH}/Kconfig --config ${SDKCONFIG}
         VERBATIM
         USES_TERMINAL)