Adds missing initializer to DataFile.cpp

[IanCaio]

The third constructor from DataFile was missing an initializer for the file version variable.

[LmmsBot]

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Windows

• Windows 32-bit: lmms-1.3.0-alpha.2%2Bg3f59cedb3-mingw-win32.exe (build link)
• Windows 64-bit: lmms-1.3.0-alpha.2%2Bg3f59cedb3-mingw-win64.exe (build link)
• Windows 32-bit: lmms-1.3.0-alpha.2+g3f59ced-msvc2017-win32.exe (build link)
• Windows 64-bit: lmms-1.3.0-alpha.2+g3f59ced-msvc2017-win64.exe (build link)

Linux

• Linux (AppImage): lmms-1.3.0-alpha.2%2Bg3f59ced-linux-x86_64.AppImage (build link)

🤖

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