Minor. Remove redundant parameter

LexicalWritableScope.implicitReceiver is always null for all constructor's usages

compiler/resolution/src/org/jetbrains/kotlin/resolve/scopes/LexicalWritableScope.kt

@@ -25,11 +25,13 @@ class LexicalWritableScope(
         parent: LexicalScope,
         override val ownerDescriptor: DeclarationDescriptor,
         override val isOwnerDescriptorAccessibleByLabel: Boolean,
-        override val implicitReceiver: ReceiverParameterDescriptor?,
         redeclarationChecker: LocalRedeclarationChecker,
         override val kind: LexicalScopeKind
 ) : LexicalScopeStorage(parent, redeclarationChecker) {
 
+    override val implicitReceiver: ReceiverParameterDescriptor?
+        get() = null
+
     private var canWrite: Boolean = true
     private var lastSnapshot: Snapshot? = null
 
@@ -96,4 +98,4 @@ class LexicalWritableScope(
         p.popIndent()
         p.println("}")
     }
-}
+}