FIX Prevent uploading more files than allowed by maxFilesLeft

[ath92]

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Description of the pull request

Related to #565

This is related to a react-dropzone bug (react-dropzone/react-dropzone#1025). I opened a PR there to fix it upstream, but while waiting for that to get merged, we can also provide an easy fix on our end by slicing any new uploads so that the amount of files that actually gets added can never be more than the max number of files left.

[github-actions]

Size Change: +31 B (0%)

Total Size: 1.26 MB

Filename	Size	Change
./dist/browser.full-bundle.js	644 kB	+6 B (0%)
./dist/browser.full-bundle.min.js	372 kB	+6 B (0%)
./dist/index.es.js	105 kB	+11 B (0%)
./dist/index.js	107 kB	+8 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
./dist/css/index.css	23 kB	0 B
./dist/css/index.js	21 B	0 B
./dist/i18n/en.json	824 B	0 B
./dist/i18n/fr.json	1.25 kB	0 B
./dist/i18n/hi.json	1.43 kB	0 B
./dist/i18n/it.json	1.19 kB	0 B
./dist/i18n/nl.json	1.17 kB	0 B
./dist/i18n/ru.json	1.47 kB	0 B
./dist/i18n/tr.json	1.19 kB	0 B

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