Fix "Add field" button visibility in project wizard

[wonder-sk]

Fixes #3209

• root.rowHeight and root.rowheight were undefined, so footer was incorrectly sized
• height of list view was not correctly calculated
• page had unnecessary margin above the toolbar

https://github.com/MerginMaps/mobile/assets/193367/130b1c6f-b439-4fe8-9f02-453f35fcc77b

[github-actions[bot]]

Pull Request Test Coverage Report for Build 8646802026

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.008%) to 60.049%

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Files with Coverage Reduction	New Missed Lines	%
input/app/projectsmodel.cpp	1	65.75%
<!--	Total:	1		-->

Totals
Change from base Build 8628227245:	-0.008%
Covered Lines:	7580
Relevant Lines:	12623

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💛 - Coveralls