turn elif into separate if in JailParams

following a suggestion from @igalic
https://github.com/bsdci/libioc/pull/646/files/abf9a76033e7a3b669c6d79995a12353d0af4c3f#r257497047

Author: gronke

libioc/JailParams.py

@@ -49,7 +49,8 @@ def value(self, value: JailParamValueType) -> None:
         """Set the user defined value of this jail parameter."""
         if self.ctl_type == freebsd_sysctl.types.NODE:
             raise TypeError("sysctl NODE has no value")
-        elif self.ctl_type in [
+
+        if self.ctl_type in [
             freebsd_sysctl.types.STRING,
             freebsd_sysctl.types.OPAQUE,
         ]: