increase the LZMA dictionary size to 64MB for the Windows installer

This reduces installer size by 40-50% similar to f6f29b0513c4019a8e70766dbb62b519922d38fb

wkhtmltox.nsi

@@ -17,7 +17,7 @@ VIAddVersionKey  "FileVersion"     "${VERSION}"
 
 CRCCheck             force
 SetCompressor /SOLID lzma
-
+SetCompressorDictSize 64
 RequestExecutionLevel admin
 
 !insertmacro MUI_PAGE_LICENSE "COPYING"
@@ -99,4 +99,4 @@ Function .onInit
   ${If} ${RunningX64}
     SetRegView 64
   ${EndIf}
-FunctionEnd
+FunctionEnd