[skip ci] Update issue templates

.github/ISSUE_TEMPLATE.md

@@ -7,7 +7,7 @@ I acknowledge that:
   - All extensions
 - I have tried the troubleshooting guide: https://tachiyomi.org/help/guides/troubleshooting-problems/
 - If this is an issue with an extension, that I should be opening an issue in https://github.com/tachiyomiorg/tachiyomi-extensions
-- I have searched the existing issues and this is new ticket **NOT** a duplicate or related to another open issue
+- I have searched the existing issues and this is new ticket **NOT** a duplicate or related to another open or closed issue
 - I will fill out the title and the information in this template
 
 Note that the issue will be automatically closed if you do not fill out the title or requested information.

.github/ISSUE_TEMPLATE/report_issue.yml

@@ -90,7 +90,7 @@ body:
       label: Acknowledgements
       description: Read this carefully, we will close and ignore your issue if you skimmed through this.
       options:
-        - label: I have searched the existing issues and this is a new ticket, **NOT** a duplicate or related to another open issue.
+        - label: I have searched the existing issues and this is a new ticket, **NOT** a duplicate or related to another open or closed issue.
           required: true
         - label: I have written a short but informative title.
           required: true

.github/ISSUE_TEMPLATE/request_feature.yml

@@ -27,7 +27,7 @@ body:
       label: Acknowledgements
       description: Read this carefully, we will close and ignore your issue if you skimmed through this.
       options:
-        - label: I have searched the existing issues and this is a new ticket, **NOT** a duplicate or related to another open issue.
+        - label: I have searched the existing issues and this is a new ticket, **NOT** a duplicate or related to another open or closed issue.
           required: true
         - label: I have written a short but informative title.
           required: true