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

Taken from the last freely licensed version of Symbola.

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: 2048
+VWidth: 2048
+Flags: HW
+LayerCount: 2
+Fore
+SplineSet
+1724 1060 m 1
+ 324 1060 l 1
+ 324 1252 l 1
+ 1724 1252 l 1
+ 1724 1060 l 1
+1724 636 m 1
+ 324 636 l 1
+ 324 828 l 1
+ 1724 828 l 1
+ 1724 636 l 1
+1724 212 m 1
+ 324 212 l 1
+ 324 404 l 1
+ 1724 404 l 1
+ 1724 212 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