fix [shell] correct error reporting when a condition execution fails

[dduportal]

Before the fix

stderr and stdout where inverted when using a shell condition that failed:

CONDITIONS:
===========

The shell 🐚 command "./examples/updateCli.generic/shell/condition.sh 2.5.1-FreeBSD" failed with an exit code of 1 and the following messages: 
stderr=

stdout=
+ ls /titi
ls: /titi: No such file or directory


✗ condition not met, skipping pipeline

=============================

After the fix

CONDITIONS:
===========

The shell 🐚 command "./examples/updateCli.generic/shell/condition.sh 2.5.1-FreeBSD" failed with an exit code of 1 and the following messages: 
stderr=
+ ls /titi
ls: /titi: No such file or directory

stdout=


✗ condition not met, skipping pipeline

=============================