Fix PDB bitfield members importing with wrong offset

[trumank]

Test binary:
bitflags.zip

Source:

struct MixedBitFields {
    uint64_t timestamp;
    uint32_t value : 24;
    bool enabled : 1;
    bool visible : 1;
    bool selected : 1;
    bool hovered : 1;
    bool focused : 1;
    bool disabled : 1;
    bool readonly : 1;
    bool dirty : 1;
    float scale;
    double position;
};

Before:

After:

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