TOOLS/mpv-osd-symbols.sfdir: add a menu icon

Taken from the last freely licensed version of Symbola and manually
adjusted the number in the glyph file to match the adjacent arrows.

Saving sfdir with fontforge also automatically removed the O flag from 2
existing glyphs. According to
https://fontforge.org/docs/techref/sfdformat.html "O" just meant "the
character was open when last saved", so it doesn't change anything
visible.

TOOLS/mpv-osd-symbols.sfdir/font.props

@@ -1,4 +1,4 @@
-SplineFontDB: 3.0
+SplineFontDB: 3.2
 FontName: mpv-osd-symbols-Regular
 FullName: mpv-osd-symbols Regular
 FamilyName: mpv-osd-symbols
@@ -22,7 +22,7 @@ OS2Version: 3
 OS2_WeightWidthSlopeOnly: 0
 OS2_UseTypoMetrics: 0
 CreationTime: 1408646554
-ModificationTime: 1576096543
+ModificationTime: 1735420479
 PfmFamily: 81
 TTFWeight: 400
 TTFWidth: 5
@@ -63,7 +63,7 @@ NameList: AGL For New Fonts
 DisplaySize: -72
 AntiAlias: 1
 FitToEm: 0
-WinInfo: 57600 8 2
+WinInfo: 57540 14 11
 BeginPrivate: 8
 BlueValues 31 [-10 0 640 650 720 730 800 810]
 BlueScale 5 0.037

TOOLS/mpv-osd-symbols.sfdir/uniE00D.glyph

@@ -1,7 +1,7 @@
 StartChar: uniE00D
 Encoding: 57357 57357 34
 Width: 880
-Flags: HWO
+Flags: HW
 HStem: 780 20G<200 200>
 VStem: 200 375<400 400 400 800>
 LayerCount: 2

TOOLS/mpv-osd-symbols.sfdir/uniE102.glyph

@@ -0,0 +1,25 @@
+StartChar: uniE102
+Encoding: 57602 57602 35
+Width: 880
+VWidth: 880
+Flags: HW
+LayerCount: 2
+Fore
+SplineSet
+880 640 m 1
+ 0 640 l 1
+ 0 800 l 1
+ 880 800 l 1
+ 880 640  l 1
+880 320 m 1
+ 0 320 l 1
+ 0 480 l 1
+ 880 480 l 1
+ 880 320 l 1
+880 0 m 1
+ 0 0 l 1
+ 0 160 l 1
+ 880 160 l 1
+ 880 0 l 1
+EndSplineSet
+EndChar

TOOLS/mpv-osd-symbols.sfdir/uniE10A.glyph

@@ -2,7 +2,7 @@ StartChar: uniE10A
 Encoding: 57610 57610 23
 Width: 1977
 GlyphClass: 2
-Flags: HMWO
+Flags: HMW
 HStem: 242 248<2 155 2 156>
 LayerCount: 2
 Fore