[Backport 2022.02.xx] #8670 Polygon Type style settings are not highlighted on user selection

[allyoucanmap]

Description

Polygon type was not selected for incorrect setValue method. The msClassificationType property should use the default setValue without implementing its own one.

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/geosolutions-it/MapStore2/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x", remove the others)

• Bugfix

Issue

What is the current behavior?

#8670

What is the new behavior?

The polygon type option is correctly selected in fill symbolizer for 3D views

Breaking change

Does this PR introduce a breaking change? (check one with "x", remove the other)

• No

Other useful information

[offtherailz]

Note for testers: the colors of selected values are different from dev. (they changed for the new version, together with the slider replaced with px input).

[offtherailz]

@ElenaGallo, could you please test this on QA ? Thank you

Note here that the color of the selected item is different from DEV.