chore(pmd.xml): remove (deprecated) AvoidPrefixingMethodParameters rule.

First it's deprecated (see #1018).
Second, it blocks me to merge fix for #1098 because it complains on inCollection variable that is
totally readable to me.

[skip ci]

Author: php-coder

src/main/config/pmd.xml

@@ -55,7 +55,6 @@
 	<!--<rule ref="category/java/codestyle.xml/AtLeastOneConstructor" />-->
 	<rule ref="category/java/codestyle.xml/AvoidDollarSigns" />
 	<rule ref="category/java/codestyle.xml/AvoidFinalLocalVariable" />
-	<rule ref="category/java/codestyle.xml/AvoidPrefixingMethodParameters" />
 	<rule ref="category/java/codestyle.xml/AvoidProtectedFieldInFinalClass" />
 	<rule ref="category/java/codestyle.xml/AvoidProtectedMethodInFinalClassNotExtending" />
 	<rule ref="category/java/codestyle.xml/AvoidUsingNativeCode" />