FIR2IR: do not skip getter generation for const properties

otherwise some IR pipeline breaks for JS, e.g. some intrinsics, like
numeric constants, are not inlined properly

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/lazy/Fir2IrLazyProperty.kt

@@ -159,7 +159,6 @@ class Fir2IrLazyProperty(
     }
 
     override var getter: IrSimpleFunction? by lazyVar(lock) {
-        if (fir.isConst) return@lazyVar null
         val signature = signatureComposer.composeAccessorSignature(
             fir,
             isSetter = false,