Fix another instance of typo

Author: mrsdizzie

features/package-install.feature

@@ -1050,7 +1050,7 @@ Feature: Install WP-CLI packages
     When I try `wp package install https://github.com/wp-cli-test/private-repository.git`
     Then STDERR should contain:
       """
-      Warning: Couldn't download composer.json file from 'https://raw.githubusercontent.com/wp-cli-test/private-repository/master/composer.json' (HTTP code 404). Presuming package name is 'wp-cli-tests/private-repository'.
+      Warning: Couldn't download composer.json file from 'https://raw.githubusercontent.com/wp-cli-test/private-repository/master/composer.json' (HTTP code 404). Presuming package name is 'wp-cli-test/private-repository'.
       """
 
     When I try `wp package install non-existent-git-user-asdfasdf/non-existent-git-repo-asdfasdf`