color-manager: Call update_all_gamma from on_monitors_changed
This ensures that an up-to-date gamma LUT is applied for newly-enabled monitors.
Closes: #2480 (closed) Closes: #2546 (closed) Closes: #3439 (closed)
This ensures that an up-to-date gamma LUT is applied for newly-enabled monitors.
Closes: #2480 (closed) Closes: #2546 (closed) Closes: #3439 (closed)