Remove removal step from `bot/build.sh` #122

Job	Run time
eessi_container_script (listrepos_default)	1m 50s
eessi_container_script (container)	2m 35s
eessi_container_script (help)	1m 20s
eessi_container_script (shell)	2m 15s
eessi_container_script (listrepos_custom)	1m 36s
eessi_container_script (resume)	1m 59s
eessi_container_script (unionfs)	1m 40s
eessi_container_script (run)	2m 2s
	15m 17s

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