Fix misc compiler warnings

src/frontend/error.nim

@@ -86,7 +86,7 @@ when defined(js):
 
         state.error = some(error)
       except:
-        kout(getCurrentExceptionMsg().cstring)
+        echo getCurrentExceptionMsg()
         state.error = some(PostError(
           errorFields: @[],
           message: "Unknown error occurred."

src/frontend/forum.nim

@@ -49,7 +49,7 @@ proc onPopState(event: dom.Event) =
   # This event is usually only called when the user moves back in their
   # history. I fire it in karaxutils.anchorCB as well to ensure the URL is
   # always updated. This should be moved into Karax in the future.
-  kout(kstring"New URL: ", window.location.href, " ", state.url.href)
+  echo "New URL: ", window.location.href, " ", state.url.href
   document.title = state.originalTitle
   if state.url.href != window.location.href:
     state = newState() # Reload the state to remove stale data.

src/frontend/replybox.nim

@@ -44,7 +44,7 @@ when defined(js):
 
   proc onPreviewPost(httpStatus: int, response: kstring, state: ReplyBox) =
     postFinished:
-      kout(response)
+      echo response
       state.rendering = some[kstring](response)
 
   proc onPreviewClick(e: Event, n: VNode, state: ReplyBox) =