Fix compilation failures for custom installation locations

[ischoegl]

Description

This PR fixes an import statement that causes compilations to fail when trying to use HighFive as a header-only library with custom install locations. Symptoms are: (i) fatal error: 'highfive/H5Utiity.hpp' not found if the conda environment does not contain a system highfive or (ii) a long error stack starting with error: redefinition of 'SilencedHDF5' [...] if trying to compile with a custom location while having a highfive package installed. Using the relative import (which is used everywhere else) fixes the issue.

• fixed relative import

How to test this?

cmake ..
make -j8
make test

Test System

• OS: macOS (inside conda environment with/without highfive package installed)
• Compiler: AppleClang 14.0.3
• Dependency versions: hdf5 1.12

[codecov]

Codecov Report

Merging #726 (a27c129) into master (e3c2f8c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #726   +/-   ##
=======================================
  Coverage   82.38%   82.38%           
=======================================
  Files          67       67           
  Lines        4503     4503           
=======================================
  Hits         3710     3710           
  Misses        793      793           

Impacted Files	Coverage Δ
include/highfive/bits/H5Object_misc.hpp	90.24% <ø> (ø)

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