Tray icon image is missing on Linux

[yuya-oc]

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• [x] This is not a troubleshooting question. Troubleshooting questions go here: http://www.mattermost.org/troubleshoot/.
• [x] This doesn't reproduce on web browsers (such as in Chrome). If it does, issue reports go to the Mattermost Server repository.
• [x] I have read contributing guidelines.

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Summary Tray icon image is missing on Linux.

Steps to reproduce

• Operating System: Linux Mint 18 Cinnamon
• Mattermost Desktop App version: master branch (b27c2dda36223acd1fdffbf5f4099b6c24352118)
• Mattermost Server version: N/A
• Clear steps to reproduce the issue
  1. Build and launch the packaged app.
  2. Enable tray icon.
  3. Restart the application.
  4. The blank space appears instead of the tray icon.

Expected behavior The png image appears.

Observed behavior The png image is missing.

Possible fixes Possibly the file path to the png image is wrong in the packaged app.

[yuya-oc]

Somehow dist/resources is not included in linux package. Probably it's bug of electron-builder or my mis-configuration. As an easy fix, it's applicable to rename src/resources to src/assets.

And now there are two "resources" directories, resources and src/resources. So renaming would also make sense to describe the purpose of directories.

[jasonblais]

Thanks @yuya-oc!