[IR] update testdata: better support for IrCall

compiler/testData/ir/irText/expressions/callableReferences/adaptedExtensionFunctions.kt.txt

@@ -24,21 +24,21 @@ fun C.extensionBoth(i: Int, s: String = "", vararg t: String) {
 
 fun testExtensionVararg() {
   use(f =   local fun extensionVararg(p0: C, p1: Int) {
-    extensionVararg($receiver = p0, i = p1)
+    p0.extensionVararg(i = p1)
   }
 )
 }
 
 fun testExtensionDefault() {
   use(f =   local fun extensionDefault(p0: C, p1: Int) {
-    extensionDefault($receiver = p0, i = p1)
+    p0.extensionDefault(i = p1)
   }
 )
 }
 
 fun testExtensionBoth() {
   use(f =   local fun extensionBoth(p0: C, p1: Int) {
-    extensionBoth($receiver = p0, i = p1)
+    p0.extensionBoth(i = p1)
   }
 )
 }