[MISC] deprecate phred_base(phred_type) constructor

[marehr]

Left over of seqan/product_backlog#358

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[codecov]

Codecov Report

Merging #2588 (6097987) into master (54379f9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2588   +/-   ##
=======================================
  Coverage   98.23%   98.23%           
=======================================
  Files         269      269           
  Lines       10561    10561           
=======================================
  Hits        10375    10375           
  Misses        186      186           

Impacted Files	Coverage Δ
include/seqan3/alphabet/quality/phred42.hpp	100.00% <ø> (ø)
include/seqan3/alphabet/quality/phred63.hpp	100.00% <ø> (ø)
include/seqan3/alphabet/quality/phred68solexa.hpp	100.00% <ø> (ø)
include/seqan3/alphabet/quality/phred94.hpp	100.00% <ø> (ø)
include/seqan3/alphabet/quality/phred_base.hpp	100.00% <ø> (ø)

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[SGSSGene]

Should work without flaw. But why replace the call to the base call with assign_phred. Any advantages or more personal taste?

[marehr]

Should work without flaw. But why replace the call to the base call with assign_phred. Any advantages or more personal taste?

To workaround annoying deprecation warnings xD