runtime(netrw): fix filetype detection for remote editing files

closes: #12990
closes: #12992

this partially reverses commit 71badf9 by commenting out the line that
intentionally sets the filetype to an empty string.

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/autoload/netrw.vim b/runtime/autoload/netrw.vim
index 14b1ab2..9548b49 100644
--- a/runtime/autoload/netrw.vim
+++ b/runtime/autoload/netrw.vim
@@ -2998,7 +2998,7 @@
    " to process this detection correctly.
 "   call Decho("detect filetype of local version of remote file<".rfile.">",'~'.expand("<slnum>"))
 "   call Decho("..did_filetype()=".did_filetype())
-   setl ft=
+"   setl ft=
 "   call Decho("..initial filetype<".&ft."> for buf#".bufnr()."<".bufname().">")
    let iskkeep= &isk
    setl isk-=/