(Fix) ETC theme fixes

[gabitoesmiapodo]

Related to #1664 (comment)

Motivation

Main changes were implemented on #1922 but I've found a few discrepancies that I addressed here. Links to the updated design can be found at #1664 (comment)

@import "theme/base_variables"; and @import "ethereum_classic_variables"; should be uncommented.

New network selector present in the design won't be styled until it's implemented.

Fixes (screenshots are before the changes):

Swapped Market Cap and Price colors.
Corrected background gradient color and orientation.
Fixed block number color.

Corrected addresses and block number's colors.

Corrected social icon's color.

Changelog

Bug Fixes

• ETC theme colors.

Checklist for your PR

• I added an entry to CHANGELOG.md with this PR
• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I checked whether I should update the docs and did so if necessary

[coveralls]

Pull Request Test Coverage Report for Build 1d86870b-9e4d-44e9-ba21-4e6ab08fe9c2

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.07%) to 80.86%

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Files with Coverage Reduction	New Missed Lines	%
apps/indexer/lib/indexer/block/catchup/fetcher.ex	2	69.23%
apps/indexer/lib/indexer/fetcher/replaced_transaction.ex	2	90.91%

Totals
Change from base Build ce4cc9d5-f1fb-4dff-b5cd-4dc431039b49:	-0.07%
Covered Lines:	4816
Relevant Lines:	5956

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💛 - Coveralls