Delete AddPrimaryKey tag which is not required with not composite index

[fsckyn3o2]

This PR is to fix liquibase execution with MariaDb which return a "Multi primary key" error (#60),

Tested on :

H2 database MariaDb ( Ver 15.1 Distrib 10.4.12-MariaDB, for Linux (x86_64) using readline 5.1 )

Before submitting a pull-request to GitBucket I have first:

• [X] read the contribution guidelines
• [X] rebased my branch over master
• [X] verified that project is compiling
• [X] verified that tests are passing
• [X] squashed my commits as appropriate (keep several commits if it is relevant to understand the PR)
• [ ] marked as closed using commit message all issue ID that this PR should correct