iniReadFile() can read lines one character longer than other ini read functions

Here: https://gitlab.synchro.net/main/sbbs/-/blob/master/src/xpdev/ini_file.c#L2962

iniReadFile() passes INI_MAX_LINE_LEN as the max line length to strListReadFile(), which results in list having lines up to INI_MAX_LINE_LEN bytes long in it, but INI_MAX_LINE_LEN is documented as including the NUL. The strListReadFile() argument does not include space for the NUL, which is added to the malloc() and fgets() arguments.