fix higher_order contiguity including lower order

[martinfleis]

Fixes #738

Funnily enough, we have the same line of code in weights/raster.py, where it is correct.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.2%. Comparing base (e82d1be) to head (94ff95e).
Report is 15 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #739     +/-   ##
=======================================
+ Coverage   83.9%   85.2%   +1.3%     
=======================================
  Files        145     145             
  Lines      15583   15642     +59     
=======================================
+ Hits       13077   13326    +249     
+ Misses      2506    2316    -190     

Files	Coverage Δ
libpysal/graph/base.py	96.8% <100.0%> (ø)
libpysal/graph/tests/test_base.py	100.0% <100.0%> (ø)
libpysal/weights/util.py	78.0% <100.0%> (ø)

... and 9 files with indirect coverage changes

[martinfleis]

(the dev failure is coming from incompatibility between pandas main and geopandas, nothing to solve here)