Update Etcher to 1.5.77

Summary:

• Fix error message not being shown on write error
• The RGBLed module has been moved to a separate repository

Signed-off-by: Régis Patroix <regis.patroix@gmail.com>

Test Plan:
Install package
Open Etcher
Flash iso on USB key

Reviewers: Triage Team, JoshStrobl

Reviewed By: Triage Team, JoshStrobl

Subscribers: JoshStrobl

Differential Revision: https://dev.getsol.us/D8285