console.lua: prettify unselected track log messages

After d49879f1f7 terminal escape sequences are printed in the console
log for unselected tracks. Remove them and make those lines grey.

player/lua/console.lua

@@ -1781,8 +1781,20 @@ mp.register_event('log-message', function(e)
     if e.level == 'trace' then return end
 
     -- Use color for debug/v/warn/error/fatal messages.
-    log_add('[' .. e.prefix .. '] ' .. e.text, styles[e.level],
-            terminal_styles[e.level])
+    local style = styles[e.level]
+    local terminal_style = terminal_styles[e.level]
+
+    -- Strip the terminal escape sequence from unselected tracks.
+    if e.prefix == 'cplayer' and e.level == 'info' then
+        local found
+        e.text, found = e.text:gsub('^\027%[38;5;8m', '')
+        if found == 1 then
+            style = styles.disabled
+            terminal_style = terminal_styles.disabled
+        end
+    end
+
+    log_add('[' .. e.prefix .. '] ' .. e.text, style, terminal_style)
 end)
 
 collectgarbage()