various: sync shown track flags

Show the same flags in loadfile.c, select.lua and stats.lua. The only
differences are that only stats.lua prints both image and albumart
because it's supposed to show detailed track information, and select.lua
prints the image flag because pressing g-v doesn't show Video or Image
like in loadfile.c and stats.lua.

player/lua/select.lua

@@ -62,6 +62,25 @@ mp.add_forced_key_binding(nil, "select-playlist", function ()
     })
 end)
 
+local function format_flags(track)
+    local flags = ""
+
+    for _, flag in ipairs({
+        "default", "forced", "dependent", "visual-impaired", "hearing-impaired",
+        "image", "external"
+    }) do
+        if track[flag] then
+            flags = flags .. flag .. " "
+        end
+    end
+
+    if flags == "" then
+        return ""
+    end
+
+    return " [" .. flags:sub(1, -2) .. "]"
+end
+
 local function format_track(track)
     return (track.selected and "●" or "○") ..
         (track.title and " " .. track.title or "") ..
@@ -78,9 +97,8 @@ local function format_track(track)
             (track["codec-profile"] and track.type == "audio"
              and track["codec-profile"] .. " " or "") ..
             (track["demux-samplerate"] and track["demux-samplerate"] / 1000 ..
-             " kHz " or "") ..
-            (track.external and "external " or "")
-        ):sub(1, -2) .. ")"
+             " kHz " or "")
+        ):sub(1, -2) .. ")" .. format_flags(track)
 end
 
 mp.add_forced_key_binding(nil, "select-track", function ()