Fix qualpath for imported modules

[growly]

Literally Dan's drive-by fix in #176

[codecov]

Codecov Report

Merging #177 (c69ae53) into main (524373b) will increase coverage by 0.01%.
Report is 11 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #177      +/-   ##
==========================================
+ Coverage   87.20%   87.22%   +0.01%     
==========================================
  Files         109      109              
  Lines        9577     9678     +101     
==========================================
+ Hits         8352     8442      +90     
- Misses       1225     1236      +11     

Files Changed	Coverage Δ
hdl21/qualname.py	86.66% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[dan-fritchman]

Great catch here.
Merging.
I'm gonna leave the generating issue #176 open until we have a test for it.