{stats,osc}.lua: respect --osd-scale-by-window by default

This lets these scripts scale the elements with OSD by default.

DOCS/interface-changes/osdscale.txt

@@ -1,2 +1,3 @@
 change `vidscale` script option type to string for osc.lua
 change `vidscale` script option type to string for stats.lua
+change `vidscale` default from `yes` to `auto` for osc.lua and stats.lua

DOCS/man/osc.rst

@@ -248,7 +248,7 @@ Configurable Options
     Scale factor of the OSC when fullscreen
 
 ``vidscale``
-    Default: yes
+    Default: auto
 
     Scale the OSC with the video.
     ``no`` tries to keep the OSC size constant as much as the window size allows.

DOCS/man/stats.rst

@@ -199,7 +199,7 @@ Configurable Options
     Color used for drawing graphs.
 
 ``vidscale``
-    Default: yes
+    Default: auto
 
     Scale the text and graphs with the video.
     ``no`` tries to keep the sizes constant.

player/lua/osc.lua

@@ -14,7 +14,7 @@ local user_opts = {
     idlescreen = true,          -- show mpv logo on idle
     scalewindowed = 1,          -- scaling of the controller when windowed
     scalefullscreen = 1,        -- scaling of the controller when fullscreen
-    vidscale = "yes",           -- scale the controller with the video?
+    vidscale = "auto",          -- scale the controller with the video?
     valign = 0.8,               -- vertical alignment, -1 (top) to 1 (bottom)
     halign = 0,                 -- horizontal alignment, -1 (left) to 1 (right)
     barmargin = 0,              -- vertical margin of top/bottombar

player/lua/stats.lua

@@ -60,7 +60,7 @@ local o = {
     shadow_y_offset = 0.0,
     shadow_color = "",
     alpha = "11",
-    vidscale = "yes",
+    vidscale = "auto",
 
     -- Custom header for ASS tags to style the text output.
     -- Specifying this will ignore the text style values above and just