QFileDialog: differentiate between recording open/save

[malleoz]

Previously, the file dialog window was ambiguous between saving or loading a .dtm. This commit simply gives a bit more context to differentiate the two windows.

[leoetlino]

LGTM (other than the lint failure)

[dolphin-emu-bot]

FifoCI detected that this change impacts graphical rendering. Here are the behavior differences detected by the system:

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