c++20: use std::erase(_if) instead of std::remove(_if)+erase (unotools)

Change-Id: Iebc949486322b55f60e83b27739acc1c16d2a25e
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/159707
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

unotools/source/config/configmgr.cxx

@@ -157,7 +157,7 @@ utl::ConfigManager::addConfigItem(utl::ConfigItem & item) {
 }
 
 void utl::ConfigManager::removeConfigItem(utl::ConfigItem & item) {
-    items_.erase(std::remove(items_.begin(), items_.end(), &item), items_.end());
+    std::erase(items_, &item);
 }
 
 void utl::ConfigManager::registerConfigItem(utl::ConfigItem * item) {

unotools/source/misc/desktopterminationobserver.cxx

@@ -180,7 +180,7 @@ namespace utl
     {
         ::osl::MutexGuard aGuard( ::osl::Mutex::getGlobalMutex() );
         Listeners& rListeners = getListenerAdminData().aListeners;
-        rListeners.erase(std::remove(rListeners.begin(), rListeners.end(), _pListener), rListeners.end());
+        std::erase(rListeners, _pListener);
     }
 
 } // namespace utl