It's not that straightforward.
It's a two wire LED string H-bridge controller. The output is 24VAC PWM. The LED string consists of two LED strings wired in reverse parallel. To keep the voltage the same, the LEDs are all be blue or violet dies, with a phosphor to convert the light to other colours. To switch between the strings, the polarity is changed by the H-bridge. The brightness is controlled by varing the PWM duty cycle. To make both strings light continiously, the each string is lit alternately with a duty cycle of 50%, but a such a high frequency, it appears to be continiously on.
Q1, Q2, Q3 & Q4 form the H-bridge. U2 is a microcontroller. To light both LED strings continiously, U2 will need to be replaced with another microcontroller, with the same power supply pin-out, which is programmed to quickly turn Q1 and Q2. Going from your photograph of the PCB, pins 6 & 7 control Q1 & Q2. R8 & ZD form a shunt regulator, which powers U2. Pin 1 of U2 is +V (3V or 5V) and pin 8 appears to go to 0V. Check using a multimeter, before looking for a suitable replacement for U2. It's highly unlikely you'll be able to reprogram 2, as it's most likely locked, or one time programmable.
See the website below for a schematic of the output stage.
https://www.da-share.com/circuits/2-wire-led-strings/