Fix ambiguity in BandedLazy * Mul

[dlfivefifty]

Fixes JuliaApproximation/ClassicalOrthogonalPolynomials.jl#240

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.72%. Comparing base (8547ddb) to head (2972ddc).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #376   +/-   ##
=======================================
  Coverage   95.72%   95.72%           
=======================================
  Files          17       17           
  Lines        3207     3208    +1     
=======================================
+ Hits         3070     3071    +1     
  Misses        137      137           

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