[FIR] Don't record `isFromVararg` attribute to all properties from constructor

compiler/fir/raw-fir/light-tree2fir/src/org/jetbrains/kotlin/fir/lightTree/fir/ValueParameter.kt

@@ -85,7 +85,9 @@ class ValueParameter(
                 modifiers.getVisibility()
             ) else null
         }.apply {
-            this.isFromVararg = firValueParameter.isVararg
+            if (firValueParameter.isVararg) {
+                this.isFromVararg = true
+            }
         }
     }
 }

compiler/fir/raw-fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/RawFirBuilder.kt

@@ -463,7 +463,9 @@ open class RawFirBuilder(
 
                 dispatchReceiverType = currentDispatchReceiverType()
             }.apply {
-                isFromVararg = firParameter.isVararg
+                if (firParameter.isVararg) {
+                    isFromVararg = true
+                }
             }
         }