console.lua: factor OSC margins before the bottom margin

OSC margins are relative to the whole height before subtracting the
bottom left margin.

player/lua/console.lua

@@ -276,8 +276,9 @@ local function calculate_max_log_lines()
                select(2, mp.get_property('term-status-msg'):gsub('\\n', ''))
     end
 
-    return math.floor((select(2, get_scaled_osd_dimensions()) - bottom_left_margin)
+    return math.floor((select(2, get_scaled_osd_dimensions())
                        * (1 - global_margins.t - global_margins.b)
+                       - bottom_left_margin)
                       / opts.font_size
                       -- Subtract 1 for the input line and 0.5 for the empty
                       -- line between the log and the input line.