fix(actions): set lnum=0 + valid=1 in sel_to_qf

For any qf entry with/without lnum, `:cnext` don't respect
`:h restore-cursor`.

With lnum=0, user can rewrite `:cnext` in script to custom
the jump behavior, since this is a file entry.

`valid=1` to make sure `:cfdo` can work as expected (#1560).

e.g. #2592 (comment)

Author: phanen

lua/fzf-lua/actions.lua

@@ -314,7 +314,8 @@ local sel_to_qf = function(selected, opts, is_loclist)
     table.insert(qf_list, {
       bufnr = file.bufnr,
       filename = file.bufname or file.path or file.uri,
-      lnum = file.line > 0 and file.line or 1,
+      lnum = file.line or 0,
+      valid = 1,
       col = file.col,
       text = text,
     })

lua/fzf-lua/profiles/cli.lua

@@ -133,8 +133,9 @@ return {
             local text = e.stripped:match(":%d+:%d?%d?%d?%d?:?(.*)$") or ""
             table.insert(qf_items, {
               filename = e.path,
-              lnum = math.max(1, e.line or 1),
-              col = math.max(1, e.col or 1),
+              lnum = e.line or 0,
+              col = e.col or 0,
+              valid = 1,
               text = text,
             })
           end