FIR: Unignore all Fir2IrText tests on context receivers

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

@@ -1,5 +1,4 @@
 // !LANGUAGE: +ContextReceivers
-// IGNORE_BACKEND_FIR: JVM_IR
 
 class O(val o: String)
 
@@ -13,4 +12,4 @@ fun box(): String {
         val ok = OK("K")
         ok.result
     }
-}
+}