XWIKI-10311: Rename XWikiContext#getDatabase() into XWikiContext#getWikiId()

...n/java/com/xpn/xwiki/gwt/api/server/XWikiServiceImpl.java

...org/xwiki/instance/internal/DefaultInstanceIdManager.java

...ava/com/xpn/xwiki/user/impl/LDAP/LDAPAuthServiceImpl.java

...n/java/com/xpn/xwiki/notify/XWikiNotificationManager.java

...atform-oldcore/src/main/java/com/xpn/xwiki/util/Util.java

.../com/xpn/xwiki/plugin/lucene/internal/IndexRebuilder.java