Fixes incorrect 'selection' and 'expansion' behaviour

[DevAhamed]

When the sections have selection/expansion mode as single and adapter has mode as multiple, then incorrect mode is set for adapter. This is discussed in this issue #72.

[codecov-io]

Codecov Report

Merging #73 into 2.x will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              2.x      #73      +/-   ##
==========================================
+ Coverage   74.88%   74.93%   +0.04%     
==========================================
  Files          20       20              
  Lines        1103     1105       +2     
  Branches      167      169       +2     
==========================================
+ Hits          826      828       +2     
  Misses        179      179              
  Partials       98       98

Impacted Files	Coverage Δ
...pter/src/main/java/mva2/adapter/NestedSection.java	77.25% <100%> (+0.21%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 76b46dd...3b073a4. Read the comment docs.