Unmute additional FIR black box tests

This was result of comparison commits together (?) with override commits

compiler/testData/codegen/box/ieee754/asComparableToDouble.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 val minus: Any = -0.0
 
 fun box(): String {

compiler/testData/codegen/box/ieee754/asComparableToDouble_properIeeeComparisons.kt

@@ -1,5 +1,4 @@
 // !LANGUAGE: +ProperIeee754Comparisons
-// IGNORE_BACKEND_FIR: JVM_IR
 
 val minus: Any = -0.0
 

compiler/testData/codegen/box/ieee754/comparableTypeCast.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 fun box(): String {
     if ((-0.0 as Comparable<Double>) >= 0.0) return "fail 0"
     if ((-0.0F as Comparable<Float>) >= 0.0F) return "fail 1"

compiler/testData/codegen/box/ir/primitiveNumberComparisons/comparableToDouble.kt

@@ -1,5 +1,4 @@
 // !LANGUAGE: +ProperIeee754Comparisons
-// IGNORE_BACKEND_FIR: JVM_IR
 
 fun ltDD(x: Comparable<Double>, y: Double) =
     x is Double && x < y

compiler/testData/codegen/box/platformTypes/primitives/compareTo.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // KJS_WITH_FULL_RUNTIME
 fun box(): String {
     val l = ArrayList<Int>()