fix build_all_local.sh script to use correct gpu-related scripts

[RafalSkolasinski]

What this PR does / why we need it:

Wrong name of script was referenced and because of that new gpu image has not been built.
This fixes bug not caught in #2509.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

None

[seldondev]

Thu Oct 1 12:46:18 UTC 2020
The logs for [pr-build] [1] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2510/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2510 --build=1

[seldondev]

Thu Oct 1 12:46:30 UTC 2020
The logs for [lint] [2] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-2510/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-2510 --build=2

[axsaucedo]

/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: axsaucedo

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