FIR: Unignore all Fir2IrText tests on context receivers

compiler/testData/ir/irText/declarations/contextReceivers/lazy.kt

@@ -1,5 +1,4 @@
 // !LANGUAGE: +ContextReceivers
-// IGNORE_BACKEND_FIR: JVM_IR
 
 interface Lazy<T>
 
@@ -42,4 +41,4 @@ fun <T> f(lazy1: Lazy<Int>, lazy2: Lazy<CharSequence>, lazyT: Lazy<T>, lazyLazyT
             test3()
         }
     }
-}
+}