Remove redundant sqlite product flavour folder in the sample app

[0xnm]

What does this PR do?

There is no sqlite flavour anymore in the sample app, so this folder can be removed.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[codecov-commenter]

Codecov Report

Merging #1559 (0ec0069) into develop (a898f20) will increase coverage by 0.12%.
Report is 2 commits behind head on develop.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1559      +/-   ##
===========================================
+ Coverage    83.21%   83.32%   +0.12%     
===========================================
  Files          437      437              
  Lines        14749    14749              
  Branches      2220     2220              
===========================================
+ Hits         12272    12289      +17     
+ Misses        1889     1879      -10     
+ Partials       588      581       -7     

see 17 files with indirect coverage changes