[JENKINS-74775] Remove unnecessary template strings in render-configurable-trend-chart.js

[yaroslavafenkin]

https://issues.jenkins.io/browse/JENKINS-74775

Testing done

Followed the instructions in https://issues.jenkins.io/browse/JENKINS-74775?focusedId=450147&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-450147.

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.42%. Comparing base (672c83e) to head (041c4d4).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #360   +/-   ##
=========================================
  Coverage     51.42%   51.42%           
  Complexity       17       17           
=========================================
  Files             7        7           
  Lines           105      105           
  Branches          3        3           
=========================================
  Hits             54       54           
  Misses           51       51           

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[uhafner]

Thanks for fixing.