Bug 1789033 - Fix whitespace issues for yaml and yml files. r=linter-reviewers,sylvestre

Differential Revision: https://phabricator.services.mozilla.com/D194918

dom/base/use_counter_metrics.yaml

@@ -39198,4 +39198,3 @@ use.counter.css.doc:
     expires: never
     send_in_pings:
       - use-counters
-

media/highway/moz.yaml

@@ -41,4 +41,3 @@ vendoring:
 
   exclude:
     - g3doc/
-

toolkit/components/nimbus/FeatureManifest.yaml

@@ -2033,4 +2033,3 @@ mailto:
         application and another prompt to set the current site as default
         webmail site in Firefox.
       fallbackPref: browser.mailto.dualPrompt.os
-

toolkit/mozapps/handling/metrics.yaml

@@ -35,4 +35,3 @@ protocolhandler.mailto:
       - active
       - events
       - metrics
-