VCS: Remove reading of very old settings

Change-Id: Id75da5d764c0ea65942c49324c2db6d033cf62a1
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/vcsbase/vcsbaseclientsettings.cpp

@@ -258,8 +258,6 @@ void VcsBaseClientSettings::readSettings(const QSettings *settings)
             break;
         }
     }
-
-    this->readLegacySettings(settings);
 }
 
 bool VcsBaseClientSettings::equals(const VcsBaseClientSettings &rhs) const
@@ -397,9 +395,4 @@ QVariant VcsBaseClientSettings::keyDefaultValue(const QString &key) const
     return QVariant(valueType(key));
 }
 
-void VcsBaseClientSettings::readLegacySettings(const QSettings *settings)
-{
-    Q_UNUSED(settings)
-}
-
 } // namespace VcsBase