fix: handle the table of content resource type correctly

[emmanuel-deloget]

All ICNS resource type entries are made of a type and a length. The resource type is always a 4 byte string - if it's shorter than 4 bytes, it is filled with space (0x20) characters. This is also the case for the 'TOC ' resource type, so add the missing space character.

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[emmanuel-deloget]

It should be noted that I had to implement this fix in order to be able to build our electron-based application, where our icons are stored in ICNS files for both our Linux and MacOS builds.

Modern ICNS tools often add a TOC\0x20 entry in the resource list, and that may not have been the case before. Add this to the fact that most linux-based builds are not based upon ICNS files and that should explain why this issue may not have been detected for 7 years (the fixed line was last changed in 2018).