[Paper] Fix color inheritance issue using nested themes

[mustafahlvc]

Continue #15100

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

[mui-pr-bot]

Details of bundle changes.

Comparing: 387b79e...195289b

bundle	parsed diff	gzip diff	prev parsed	current parsed	prev gzip	current gzip
@material-ui/core	+0.01% 🔺	0.00%	311,042	311,071	84,214	84,216
@material-ui/core/Paper	+0.04% 🔺	+0.03% 🔺	67,279	67,308	19,970	19,976
@material-ui/core/Paper.esm	+0.05% 🔺	+0.03% 🔺	60,640	60,669	18,897	18,903
@material-ui/core/Popper	0.00%	0.00%	31,115	31,115	10,793	10,793
@material-ui/core/Textarea	0.00%	0.00%	5,472	5,472	2,367	2,367
@material-ui/core/TrapFocus	0.00%	0.00%	3,731	3,731	1,565	1,565
@material-ui/core/styles/createMuiTheme	0.00%	0.00%	15,898	15,898	5,770	5,770
@material-ui/core/useMediaQuery	0.00%	0.00%	2,106	2,106	973	973
@material-ui/lab	0.00%	0.00%	140,720	140,720	42,642	42,642
@material-ui/styles	0.00%	0.00%	50,833	50,833	15,019	15,019
@material-ui/system	0.00%	0.00%	11,765	11,765	3,922	3,922
Button	0.00%	0.00%	85,622	85,622	25,618	25,618
Modal	0.00%	0.00%	79,337	79,337	23,972	23,972
colorManipulator	0.00%	0.00%	3,904	3,904	1,543	1,543
docs.landing	0.00%	0.00%	51,154	51,154	11,250	11,250
docs.main	0.00%	0.00%	648,059	648,088	202,187	202,190
packages/material-ui/build/umd/material-ui.production.min.js	+0.01% 🔺	+0.01% 🔺	292,088	292,117	82,119	82,127

Generated by 🚫 dangerJS against 195289b

[oliviertassinari]

@mustafahlvc Well done!