Issue #148: Make RelocsWidget constructor like ExportsWidget

[atom-bomb]

For some subtleties of C++ constructors that are lost on me, making the RelocsWidget constructor look the same as the ExportsWidget constructor dodges a segfault at startup. I've tested this only on x86_64 Ubuntu 22.04.3

Checklist

• [ ] Closing issues: #issue
• [ X] Mark this if you consider it ready to merge
• [ ] I've added tests (optional)
• [ ] I wrote some documentation

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