Revert "Fix enforcer plugin lifecycle mapping after upgrade to 3.2.1" (#214)

Reverts #213

With latest IDE versions of Eclipse and VS Code no warning appears, even
without this m2e setting.

Author: beckermarc

pom.xml

@@ -141,7 +141,6 @@
 				<version>3.2.1</version>
 				<executions>
 					<execution>
-						<?m2e ignore?>
 						<id>Project Structure Checks</id>
 						<goals>
 							<goal>enforce</goal>