Simplify FluentPropertyBeanIntrospector#propertyName

[basil]

As observed by @ppkarwasz in #359 (comment):

Introspector.decapitalize() actually also handles empty or single character names.

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[ppkarwasz]

Hi @basil,

Looks good to me, thanks!

[garydgregory]

Can the 1.X branch benefit from the same?

[basil]

Can the 1.X branch benefit from the same?

@garydgregory Yes; I filed #365 to backport this to the 1.x line.