[MenuItem] Fix dense prop support

[sumedhan]

• I have followed (at least) the PR section of the contributing guide.

Closes #16488

Thanks!

[mui-pr-bot]

Details of bundle changes.

Comparing: 7d826a9...060a8a7

bundle	parsed diff	gzip diff	prev parsed	current parsed	prev gzip	current gzip
@material-ui/core	+0.01% 🔺	+0.02% 🔺	327,349	327,398	90,365	90,383
@material-ui/core/Paper	0.00%	0.00%	68,290	68,290	20,375	20,375
@material-ui/core/Paper.esm	0.00%	0.00%	61,574	61,574	19,155	19,155
@material-ui/core/Popper	0.00%	0.00%	28,942	28,942	10,408	10,408
@material-ui/core/Textarea	0.00%	0.00%	5,505	5,505	2,365	2,365
@material-ui/core/TrapFocus	0.00%	0.00%	3,753	3,753	1,576	1,576
@material-ui/core/styles/createMuiTheme	0.00%	0.00%	16,012	16,012	5,793	5,793
@material-ui/core/useMediaQuery	0.00%	0.00%	2,595	2,595	1,103	1,103
@material-ui/lab	0.00%	0.00%	137,896	137,896	42,523	42,523
@material-ui/styles	0.00%	0.00%	51,699	51,699	15,348	15,348
@material-ui/system	0.00%	0.00%	15,428	15,428	4,395	4,395
Button	0.00%	0.00%	84,442	84,442	25,738	25,738
Modal	0.00%	0.00%	14,515	14,515	5,088	5,088
Portal	0.00%	0.00%	3,471	3,471	1,573	1,573
Slider	0.00%	0.00%	74,976	74,976	23,292	23,292
colorManipulator	0.00%	0.00%	3,904	3,904	1,543	1,543
docs.landing	0.00%	0.00%	54,338	54,338	13,762	13,762
docs.main	+0.01% 🔺	+0.01% 🔺	647,009	647,058	203,904	203,931
packages/material-ui/build/umd/material-ui.production.min.js	+0.02% 🔺	+0.02% 🔺	299,721	299,770	85,971	85,987

Generated by 🚫 dangerJS against 060a8a7

[eps1lon]

@sumedhan It's a great first pull request on Material-UI. Thank you for working on it!

[sumedhan]

Thanks @eps1lon !