Fix location of java after openjdk moved in docker image

[NickGrantX]

Motivation and Context

The docker image openjdk:11-slim has changed the location of the java binary.

What has changed

Changed the java path to the correct one.

How to test?

Build the image. Container should start.

Links

Trello: https://trello.com/c/7ivpCfY6
Reasons why stuff got broken: docker-library/openjdk#320 (comment)

Screenshots (if appropriate):

[NickGrantX]

BUG: Case Processor won't start because it can't find java executable

[codecov]

Codecov Report

Merging #7 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #7   +/-   ##
=========================================
  Coverage     84.13%   84.13%           
  Complexity      192      192           
=========================================
  Files            32       32           
  Lines           435      435           
  Branches         18       18           
=========================================
  Hits            366      366           
  Misses           61       61           
  Partials          8        8

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