Fix flaky distribution system specs (#4869)

We were saving a new distribution (which causes a redirect to that
distribution's show page) and then immediately clicking on the distributions
index page (which redirects as well). This introduced a race condition that
was flaky when we tried to click a link that didn't exist on the page.

Author: coalest

spec/system/distribution_system_spec.rb

@@ -558,9 +558,9 @@
 
     context "when editing that distribution" do
       before do
-        click_on "Distributions", match: :first
-        click_on "Edit", match: :first
         @distribution = Distribution.last
+        expect(page).to have_current_path(distribution_path(@distribution.id))
+        click_on "Make a Correction"
       end
 
       it "User creates a distribution from a donation then edits it" do