Unnecessary FpDefault reference in eo-maven-plugin code

[0pdd]

The puzzle 4851-2fc47960 from #4851 has to be resolved:

eo/eo-maven-plugin/src/main/java/org/eolang/maven/FpDefault.java

Lines 29 to 31 in 774d378

	* @todo #4851:60min Remove {@link FpDefault} from codebase.
	* The {@link FpDefault} class is used only in tests.
	* We should remove it and all tests that use it.

The puzzle was created by @yegor256 on 06-Feb-26.

Estimate: 60 minutes, role: DEV.

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