[recnet-api] Fix slack message bug (#365)

## Description

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There's a "false" prefix in slack template. Remove it.

![Screenshot 2024-11-26 at 10 16
25 PM](https://github.com/user-attachments/assets/76d56de7-a4a1-4e99-937d-45599a31d624)

## Related Issue

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issue first -->
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## Notes

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## Test

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## Screenshots (if appropriate):

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## TODO

- [ ] Clear `console.log` or `console.error` for debug usage
- [ ] Update the documentation `recnet-docs` if needed

apps/recnet-api/src/modules/slack/templates/weekly-digest.template.ts

@@ -57,7 +57,7 @@ export const weeklyDigestSlackTemplate = (
 
   const messageBlocks = BlockCollection(
     Blocks.Header({
-      text: `${nodeEnv !== "production" && "[DEV] "}📬 Your Weekly Digest for ${formatDate(cutoff)}`,
+      text: `${nodeEnv !== "production" ? "[DEV] " : ""}📬 Your Weekly Digest for ${formatDate(cutoff)}`,
     }),
     Blocks.Section({
       text: `You have ${Md.bold(`${recs.length}`)} recommendations this week!`,