as31: Revert unintended changes in plugin.xml.as31

idea/src/META-INF/plugin.xml.as31

@@ -481,6 +481,8 @@ The Kotlin plugin provides language support in IntelliJ IDEA and Android Studio.
 
     <codeInsight.linkHandler prefix="#kotlinClass/" handlerClass="org.jetbrains.kotlin.idea.highlighter.markers.KotlinClassTooltipLinkHandler"/>
 
+    <defaultHighlightingSettingProvider language="kotlin" implementation="org.jetbrains.kotlin.idea.highlighter.KotlinDefaultHighlightingSettingsProvider"/>
+
     <typeDeclarationProvider implementation="org.jetbrains.kotlin.idea.codeInsight.KotlinTypeDeclarationProvider"/>
 
     <completion.contributor language="kotlin"
@@ -2834,11 +2836,11 @@ The Kotlin plugin provides language support in IntelliJ IDEA and Android Studio.
     />
 
     <localInspection implementationClass="org.jetbrains.kotlin.idea.inspections.CanSealedSubClassBeObjectInspection"
-                     displayName="Refactor Sealed Sub-class to Object"
+                     displayName="Sealed sub-class without state and overridden equals"
                      groupPath="Kotlin"
-                     groupName="Style issues"
+                     groupName="Probable bugs"
                      enabledByDefault="true"
-                     level="INFO"
+                     level="WEAK WARNING"
                      language="kotlin"
     />
 
@@ -2852,7 +2854,7 @@ The Kotlin plugin provides language support in IntelliJ IDEA and Android Studio.
     />
 
     <localInspection implementationClass="org.jetbrains.kotlin.idea.inspections.MainFunctionReturnUnitInspection"
-                     displayName="Main function should return Unit"
+                     displayName="Entry point function should return Unit"
                      groupPath="Kotlin"
                      groupName="Probable bugs"
                      enabledByDefault="true"