Enable reporting about unused baseline entries

Author: alcaeus

psalm-baseline.xml

@@ -264,7 +264,6 @@
   <file src="src/Operation/Aggregate.php">
     <MixedArgument>
       <code><![CDATA[$this->options['typeMap']]]></code>
-      <code><![CDATA[$this->options['typeMap']]]></code>
     </MixedArgument>
     <MixedAssignment>
       <code><![CDATA[$cmdOptions['maxAwaitTimeMS']]]></code>

psalm.xml.dist

@@ -3,7 +3,7 @@
     errorLevel="1"
     errorBaseline="psalm-baseline.xml"
     resolveFromConfigFile="true"
-    findUnusedBaselineEntry="false"
+    findUnusedBaselineEntry="true"
     findUnusedCode="false"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="https://getpsalm.org/schema/config"