Fix EDU Coexistence flag command-line name

Bug: 1128446
Change-Id: I5553441f4d533d516fdb45955e2be5431cb7a621
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416893
Auto-Submit: Dan S <danan@chromium.org>
Reviewed-by: Yilkal Abe <yilkal@chromium.org>
Commit-Queue: Yilkal Abe <yilkal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807960}

chrome/browser/supervised_user/supervised_user_features.cc

@@ -13,6 +13,6 @@ const base::Feature kSupervisedUserInitiatedExtensionInstall{
     "SupervisedUserInitiatedExtensionInstall",
     base::FEATURE_ENABLED_BY_DEFAULT};
 
-const base::Feature kEduCoexistenceFlowV2{"kEduCoexistenceV2",
+const base::Feature kEduCoexistenceFlowV2{"EduCoexistenceV2",
                                           base::FEATURE_DISABLED_BY_DEFAULT};
 }  // namespace supervised_users