bug(developer): if first launch is by double-clicking .kmn, error with sentry

**Describe the bug**

Per https://community.software.sil.org/t/keyman-14-beta-feedback/4115/30:

> I just downloaded and installed keymandeveloper-14.0.266. ... After that I clicked on a kmn file I was in the process of developing but instead of Keyman Developer a dialog box showed up saying:
> Application Error
> Exception EAccessViolation in module sentry.dll at 0000CB15.
> Access violation at address 52A5CB15 in module ‘sentry.dll’. Read of address 00000010.

> I’m running Windows 10 Pro 64bit (Version 20H2, OS Build 19042.867).
> I now reinstalled Keyman Developer 14 (14.0.266). (I had gone back to version 13 so that I could continue working on my keyboard.) This time I wasn’t told that I needed to restart the system.
> I started Keyman Developer 14 again by clicking on the kmn file I’m working on and the same exception occurred again. I have not yet installed Keyman 14. Keyman 13 is installed but not running at that moment. (InKey 2 is running at that moment, in case that makes a difference.)
> Then I started Keyman Developer 14 from the Start Menu as you suggested. This time it came up as it should.
> Then I quit Keyman Developer 14 and started it again by clicking on the kmn I’m working on, and now it works fine as expected every time!

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**Keyman Developer:**
- OS: Windows 10 20H2 x64
- Keyman Developer version: 14.0.266-beta

Private report: https://community.software.sil.org/t/4537