Preventing a launch of Flask when -g none is specified. Fixes #2337

[LeStarch]

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Change Description

This fixes an issue where -g none would launch Flask and just not open the browser. This had the negative effect that RAM usage would spiral as no clients attached allowing histories to clear.

Now flask will not launch at all. Here is what was tested:

• Flask does not launch
• Test API scripts can still run w/o flask
• fprime-cli telemetry and events still run w/o flask
• fprime-cli send commands works w/o flask

[LeStarch]

Fixes nasa/fprime#2337