Change ETD facet label from Advisor to Committee Chair

[alawvt]

No description provided.

[alawvt]

I think the error was added in commit 135c015#diff-eb41d8cfa0737f07840838d3b8633f08 line 778,

   <!--Search filter facet configuration beans-->
    <bean id="searchFilterAdvisor" class="org.dspace.discovery.configuration.DiscoverySearchFilterFacet">
        <property name="indexFieldName" value="advisor"/>
        <property name="metadataFields">
            <list>
                <value>dc.contributor.committeechair</value>
                <value>dc.contributor.committeecochair</value>
                <value>dc.contributor.advisor</value>
            </list>
        </property>
        <property name="facetLimit" value="5"/>
        <property name="sortOrderSidebar" value="COUNT"/>
        <property name="sortOrderFilterPage" value="COUNT"/>
    </bean>