[Scripting] Level::getFrameIds() returns wrong id for the level of single image

[kogaki]

>> l = new Level("/Users/keisuke_ogaki/Desktop/ottest4.png") 
Raster level (ottest4, 1 frames)
>> fids = l.getFrameIds();
["-"]
>> l.getFrame("-") #I changed regexp
undefined
>> l.getFrame("-2")
Raster image ( 1920 x 1080 )

getFrameIds must return ["-2"]

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[kogaki]

This bug was found after other bug #345 was fixed

[RodneyBaker]

I cannot help but wonder if this issue and #2885 (Fix playback skipping first frame) are related.
The thought being that internals might be counting from 0 instead of 1 or 1 instead of 0, where applicable.

It is unclear if this is still an issue in current releases.
Last confirmation of the issue was via @kogaki in 2016.