[IR] Don't print multifile/synthetic facade class names in irText tests

This only applies to JVM and fq-names in declaration references
in IR dumps.

This enables us to run more irText tests on platforms other than JVM
(see KT-58605).

compiler/testData/ir/irText/declarations/kt47527.kt

@@ -1,7 +1,5 @@
 // ISSUE: KT-47527
 // WITH_STDLIB
-// IGNORE_BACKEND: JS_IR
-// IGNORE_BACKEND: JS_IR_ES6
 
 fun test_1(value: Any?): String? = value?.let { return "O" }
 fun test_2(value: Any?): String? = run {