[FIR] KT-56877: Allow referencing implicit receivers in class contracts

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/body/resolve/BodyResolveContext.kt

@@ -382,15 +382,9 @@ class BodyResolveContext(
     fun <T> withRegularClass(
         regularClass: FirRegularClass,
         holder: SessionHolder,
-        forContracts: Boolean = false,
         f: () -> T
     ): T {
         storeClassIfNotNested(regularClass, holder.session)
-        if (forContracts) {
-            return withTypeParametersOf(regularClass) {
-                withContainerClass(regularClass, f)
-            }
-        }
         return withTowerDataModeCleanup {
             if (!regularClass.isInner && containerIfAny is FirRegularClass) {
                 towerDataMode = if (regularClass.isCompanion) {

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/contracts/FirAbstractContractResolveTransformerDispatcher.kt

@@ -254,7 +254,7 @@ abstract class FirAbstractContractResolveTransformerDispatcher(
         }
 
         override fun transformRegularClass(regularClass: FirRegularClass, data: ResolutionMode): FirStatement {
-            context.withRegularClass(regularClass, components, forContracts = true) {
+            context.withRegularClass(regularClass, components) {
                 transformDeclarationContent(regularClass, data)
             }
             return regularClass