Check param is anonymous using param by SymbolInformation (instead of empty displayName)

[tanishiking]

scalafix-unused/rules/src/main/scala/fix/UnusedSymbol.scala

Lines 24 to 33 in b29ec64

	// TODO: should be tested by symbol.info.map(_.isGiven)
	// update scala3 https://github.com/lampepfl/dotty/pull/13239
	// and update scalameta and scalafix needed
	val paramName = if (name.nonEmpty) name else s"using ${paramTree.syntax}"
	UnusedDiagnostic.UnusedParameter(
	paramName,
	owner.getDisplayName,
	pos,
	)
	}