Fix: string index error causes failed load in kitty #959
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```lua
local red_green_string = hex:sub(1, 5)
local blue_value = tonumber(hex:sub(6, 7), 16)
```
would read the first 5 digits as red-green and the last digit as blue
then
```lua
ans[accent] = string.format("%s%.2x", red_green_string, blue_value)
```
would format the 6th digit to be 2 characters wide.
So the hex_to_rgb would parse a 7-digit hex code and crash
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would read the first 5 digits as red-green and the last digit as blue
then
would format the 6th digit to be 2 characters wide.
So the hex_to_rgb would parse a 7-digit hex code and crash