Fix: Improve contrast for like_component (#4018)

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## Because
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The purpose of the PR is to fix the contrast for submissions in light
theme so it is easier to see


## This PR
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changes. -->
- Improves the contrast in like_component to AA level in light theme


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Closes #4013

## Additional Information
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Note: In `def bg_color_class` I left the string empty so that the heart
icon will inherit the color from the button

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app/components/project_submissions/like_component.html.erb

@@ -1,5 +1,5 @@
 <%= turbo_frame_tag dom_id(project_submission, :likes) do %>
-  <%= button_to project_submission_v2_like_path(project_submission), method: http_action, disabled: current_users_submission, class: "text-gray-400 mr-4 flex items-center #{'hint--top' unless current_users_submission}", data: { test_id: 'like-submission' }, aria: { label: 'Like submission' } do %>
+  <%= button_to project_submission_v2_like_path(project_submission), method: http_action, disabled: current_users_submission, class: "text-gray-500 dark:text-gray-300 mr-4 flex items-center #{'hint--top' unless current_users_submission}", data: { test_id: 'like-submission' }, aria: { label: 'Like submission' } do %>
     <span class="mr-1" data-test-id="like-count"><%= project_submission.cached_votes_total %></span>
     <%= inline_svg_tag 'icons/heart.svg', class: "h-5 w-5 #{bg_color_class}", aria: true, title: 'heart', desc: 'heart icon' %>
   <% end %>

app/components/project_submissions/like_component.rb

@@ -16,7 +16,7 @@ def http_action
     def bg_color_class
       return 'text-teal-700' if current_users_submission || project_submission.liked?
 
-      'text-gray-400'
+      ''
     end
   end
 end