tdf#93302: Fix OpenSymbol %phi and %varphi glyphs

The glyphs for %phi and %varphi symbols were swapped in commit
81001f2c (back in 2009), as part of
https://bz.apache.org/ooo/show_bug.cgi?id=105084 (see the document
attached there), but no justification was given.

Given the shape of the symbols after that change contradicts the ones in
the Unicode code charts and other popular math fonts, I simply swapped
them back.

Change-Id: I0133a3d07df932f144ec5900103e11e27f174a5e
Reviewed-on: https://gerrit.libreoffice.org/17822Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

extras/source/truetype/symbol/OpenSymbol.sfd

@@ -3,8 +3,8 @@ FontName: OpenSymbol
 FullName: OpenSymbol
 FamilyName: OpenSymbol
 Weight: Book
-Copyright: (c) 2009 Sun Microsystems Inc.\nTHERE DOES NOT EXIST (c) 2011 Julien Nabet\nPRECEDES <-> DOES NOT SUCCEED (c) 2011 Olivier Hallot\nPRIME <-> TRIPLE PRIME (c) 2013 Mathias Hasselmann
-Version: 102.6
+Copyright: (c) 2009 Sun Microsystems Inc.\nTHERE DOES NOT EXIST (c) 2011 Julien Nabet\nPRECEDES <-> DOES NOT SUCCEED (c) 2011 Olivier Hallot\nPRIME <-> TRIPLE PRIME (c) 2013 Mathias Hasselmann\nphi <-> phi1 (c) 2015 Khaled Hosny
+Version: 102.7
 ItalicAngle: 0
 UnderlinePosition: -143
 UnderlineWidth: 20
@@ -773,7 +773,7 @@ ShortTable: maxp 16
   0
   0
 EndShort
-LangName: 1033 "" "" "Regular" "OpenSymbol" "" "Version 102.6" 
+LangName: 1033 "" "" "Regular" "OpenSymbol" 
 GaspTable: 1 65535 2 0
 Encoding: Custom
 UnicodeInterp: none
@@ -105039,8 +105039,8 @@ EndSplineSet
 Validated: 16385
 EndChar
 
-StartChar: phi
-Encoding: 954 966 954
+StartChar: phi1
+Encoding: 954 981 954
 Width: 1067
 Flags: W
 HStem: 892.524 48.4775<480.52 486.132 580.854 586.484>
@@ -105980,8 +105980,8 @@ EndSplineSet
 Validated: 16385
 EndChar
 
-StartChar: phi1
-Encoding: 960 981 960
+StartChar: phi
+Encoding: 960 966 960
 Width: 1235
 Flags: W
 HStem: -18.1895 52.1895<714 854.086> 869 62<321.383 492.494 803.829 998.555>