Revert changes to string property

Author: rnons

src/Halogen/VDom/DOM/Prop.purs

@@ -197,7 +197,7 @@ removeProperty = EFn.mkEffectFn2 \key el →
   EFn.runEffectFn3 Util.hasAttribute null key el >>= case _ of
     true -> EFn.runEffectFn3 Util.removeAttribute null key el
     false -> case typeOf (Fn.runFn2 Util.unsafeGetAny key el) of
-      "string" → EFn.runEffectFn3 Util.removeAttribute null key el
+      "string" → EFn.runEffectFn3 Util.unsafeSetAny key "" el
       _        → case key of
         "rowSpan" → EFn.runEffectFn3 Util.unsafeSetAny key 1 el
         "colSpan" → EFn.runEffectFn3 Util.unsafeSetAny key 1 el