Fix fetch-web-ext-lint's web-ext-lint.txt existence check

Bug: misc:9
Change-Id: Id4ac97e0e95cbbb54673d8b1142927d398347c3b
diff --git a/roles/fetch-web-ext-lint/tasks/main.yaml b/roles/fetch-web-ext-lint/tasks/main.yaml
index 8a81b51..8fab426 100644
--- a/roles/fetch-web-ext-lint/tasks/main.yaml
+++ b/roles/fetch-web-ext-lint/tasks/main.yaml
@@ -1,7 +1,7 @@
 - name: Is there a web-ext-lint.txt
   register: stat_wel_txt
   stat:
-    path: "{{ zuul.project.src_dir }}"
+    path: "{{ zuul.project.src_dir }}/web-ext-lint.txt"
 
 - name: Store on executor
   when: stat_wel_txt.stat.exists