[FIR] Fix generating this reference in delegated accessors

There was a problem with delegated extension property with dispatch
  receiver that `this` in `getValue` call was set to dispatch receiver
  instead of extension one

compiler/testData/codegen/box/delegatedProperty/delegateForExtPropertyInClass.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 import kotlin.reflect.KProperty
 
 class Delegate {

compiler/testData/codegen/box/delegatedProperty/optimizedDelegatedProperties/mixedArgumentSizes.kt

@@ -1,6 +1,5 @@
 // !LANGUAGE: -NewInference
 
-// IGNORE_BACKEND_FIR: JVM_IR
 inline operator fun Double.provideDelegate(thisRef: Any?, kProp: Any?) = this.toLong()
 
 inline operator fun Long.getValue(thisRef: Any?, kProp: Any?) = this.toInt()
@@ -59,4 +58,4 @@ fun box(): String {
     x.test(intArray)
     
     return "OK"
-}
+}

compiler/testData/codegen/box/delegatedProperty/provideDelegate/memberExtension.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // WITH_RUNTIME
 
 object Host {
@@ -13,4 +12,4 @@ object Host {
     val ok = "O".plusK
 }
 
-fun box(): String = Host.ok
+fun box(): String = Host.ok

compiler/testData/codegen/box/ir/serializationRegressions/deepGenericDelegatedProperty.kt

@@ -1,6 +1,5 @@
 // DONT_TARGET_EXACT_BACKEND: WASM
 // WASM_MUTE_REASON: PROPERTY_REFERENCES
-// IGNORE_BACKEND_FIR: JVM_IR
 // IGNORE_BACKEND: NATIVE
 //For KT-6020
 
@@ -59,4 +58,4 @@ fun box(): String {
     val p = Value("O", CR("K"))
     val rr = p.additionalText
     return rr.p1 + rr.p2
-}
+}