video: increase --monitorpixelaspect range

Some people use very wide display modes such as 3840x240 with their CRT
televisions because it lessens scaling artifacts in video game
emulators. When using a 3840x240 display mode on a 4:3 CRT television,
the pixel aspect ratio is 1:12, so in order to watch a video with mpv on
the same television without changing the display mode, the user should
use --monitorpixelaspect=1:12.

Unfortunately, 1:12 (or 0.083) was out of range for the
--monitorpixelaspect option. There was no good reason for this, so
extend the range of the option to 1:32-32:1 (0.03125-32,) which should
be more than enough to support "super-wide" display modes like these.

This is related to #4483, but it doesn't fix the issue (which was to do
with subtitle rendering.)

options/options.c

@@ -142,7 +142,7 @@ static const m_option_t mp_vo_opt_list[] = {
     OPT_FLAG("force-window-position", force_window_position, 0),
     OPT_STRING("x11-name", winname, 0),
     OPT_FLOATRANGE("monitoraspect", force_monitor_aspect, 0, 0.0, 9.0),
-    OPT_FLOATRANGE("monitorpixelaspect", monitor_pixel_aspect, 0, 0.2, 9.0),
+    OPT_FLOATRANGE("monitorpixelaspect", monitor_pixel_aspect, 0, 1.0/32.0, 32.0),
     OPT_FLAG("fullscreen", fullscreen, 0),
     OPT_ALIAS("fs", "fullscreen"),
     OPT_FLAG("native-keyrepeat", native_keyrepeat, 0),