Update similarissues.yml to include body information as well (#4295)

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Issue bot now includes info about the issue body, improving its
accuracy.

- [ X] I have signed the [Contributor License
Agreement](https://cla.opensource.microsoft.com/microsoft/winget-pkgs).
- [ ] This pull request is related to an issue.

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Author: craigloewen-msft

.github/workflows/similarissues.yml

@@ -15,7 +15,8 @@ jobs:
       - id: getBody
         uses: craigloewen-msft/GitGudSimilarIssues@main
         with:
-          issuetitle: ${{ github.event.issue.title }}
+          issueTitle: ${{ github.event.issue.title }}
+          issueBody: ${{ github.event.issue.body }}
           repo: ${{ github.repository }}
           similaritytolerance: '0.75'
   add-comment: