(moneta) Fix MonetaMoneyModule.getModuleName() returning "JavaxMoneyModule"

[pjfanning]

Problem

Copy-paste slip in MonetaMoneyModule:

@Override
public String getModuleName() {
    return JavaxMoneyModule.class.getSimpleName();   // -> "JavaxMoneyModule"
}

So the module reports itself under the base module's name:

new MonetaMoneyModule().getModuleName()  ->  "JavaxMoneyModule"
new JavaxMoneyModule().getModuleName()   ->  "JavaxMoneyModule"

Registration itself is fine — getRegistrationId() correctly resolves to tools.jackson.datatype.moneta.MonetaMoneyModule, so there is no duplicate-registration collision between the two modules — but the name is wrong everywhere it gets reported.

Fix

Return MonetaMoneyModule.class.getSimpleName().

Tests

New ModuleNameTest: asserts the moneta module's own name, that it differs from the base module's, and that JavaxMoneyModule keeps its (already correct) name.

javax-money 135 tests and moneta 140 tests all green.