fix(ui): use vuetify's material design palette colors for protocol color

[acshef]

This PR is intended to update the colors of the protocol icons to those of the Material design palette offered by Vuetify. This matches the color palette of the other columns in the node table.

Considerations:

• In the spirit of an easily digestible PR, I am not addressing non-Material colors elsewhere in the ZWJS UI
• I tried using colors.indigo.base for Protocols.ZWave, but the contrast between ZWave and ZWaveLongRange wasn't great. There isn't a good color in the material design palette that's close to the outdated rgb(0, 0, 255) color -- perhaps one of the indigo/blue accent colors would better match the original author's intention.
• There's no requirement to adhere to the original author's intention -- it's not like we're using colors chosen by the Z-Wave Alliance to represent protocol icons, so we could pick something other than blue if it feels like those are too close to the app's primary color.

Before:

After:

[robertsLando]

Thanks @acshef !

[coveralls]

Pull Request Test Coverage Report for Build 8850151443

Details

• 0 of 4 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.002%) to 21.787%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/lib/utils.js	0	4	0.0%
<!--	Total:	0	4	0.0%	-->

Totals
Change from base Build 8847191079:	-0.002%
Covered Lines:	3896
Relevant Lines:	19006

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💛 - Coveralls