CONFIGURATION-813: mailapi follow up

[darkma773r]

• simplify mailapi type conversions

[garydgregory]

LGTM, one change noted.

[codecov-commenter]

Codecov Report

Merging #188 (c5c6227) into master (9a828da) will increase coverage by 0.04%.
The diff coverage is 62.50%.

@@             Coverage Diff              @@
##             master     #188      +/-   ##
============================================
+ Coverage     89.42%   89.47%   +0.04%     
  Complexity     3604     3604              
============================================
  Files           183      183              
  Lines         10005    10000       -5     
  Branches       1352     1351       -1     
============================================
  Hits           8947     8947              
+ Misses          774      770       -4     
+ Partials        284      283       -1     

Impacted Files	Coverage Δ
...ache/commons/configuration2/DataConfiguration.java	95.86% <ø> (ø)
...mons/configuration2/convert/PropertyConverter.java	75.41% <62.50%> (+1.53%)	⬆️

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