Update service icon file name, and copy it into the dist directory as well

builders/windows-builder.py

@@ -390,6 +390,8 @@ class WindowsBuilder(Builder):
         copy(self.icon_path, os.path.join(self.dist_path, 'OpenLP.ico'))
         self._print_verbose('... LICENSE.txt')
         copy(self.license_path, os.path.join(self.dist_path, 'LICENSE.txt'))
+        self._print_verbose('... service_file.ico')
+        copy(self.icon_path, os.path.join(self.dist_path, 'service_file.ico'))
         if os.path.isfile(os.path.join(self.helpfile_path, 'OpenLP.chm')):
             self._print_verbose('... OpenLP.chm')
             copy(os.path.join(self.helpfile_path, 'OpenLP.chm'), os.path.join(self.dist_path, 'OpenLP.chm'))

windows/file-associations.xml

@@ -1,4 +1,4 @@
-<ProgId Id="OpenLP.Service" Description="OpenLP Service File" Icon="[APPLICATIONFOLDER]service-file.ico" Advertise="yes">
+<ProgId Id="OpenLP.Service" Description="OpenLP Service File" Icon="[APPLICATIONFOLDER]service_file.ico" Advertise="yes">
     <Extension Id="osz">
         <Verb Id="Open" Command="Open" Argument="&quot;%1&quot;" />
         <MIME Advertise="yes" ContentType="application/-x-openlp-service" Default="yes" />