Fixed link issue in alert components

Trello:https://trello.com/c/z7rB15KV/1347-eos-wc-global-alert-success-doesnt-have-style

Summary of the change:

After this fix Outside style can not override a tag styles in alerts

How to test:

Run polymer server

open http://127.0.0.1:8081/components/eos-webcomponents/ try to add style to override A tag in index.html global alert should have link color white and other alerts(section and inline) should have link color in the dark gray

Merge request reports

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