Fix incorrect inner product when building the phase

Description

Fixed inner product between vectors of different sizes that was done when the code was compiled for max dim>3.

Codecov Report

Merging #389 into develop will not change coverage. The diff coverage is 66.66%.

@@           Coverage Diff            @@
##           develop     #389   +/-   ##
========================================
  Coverage    70.18%   70.18%           
========================================
  Files          432      432           
  Lines       115085   115085           
========================================
  Hits         80776    80776           
  Misses       34309    34309

Impacted Files	Coverage Δ
src/hamiltonian/hamiltonian.F90	78.09% <66.66%> (ø)

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merged