Shrink the geo_maxmind storage after garbage collection.

include/flat_map.h

@@ -98,6 +98,7 @@ public:
 
 	void clear() { vect.clear(); }
 	void reserve(size_type n) { vect.reserve(n); }
+	void shrink_to_fit() { vect.shrink_to_fit(); }
 
 	iterator begin() { return vect.begin(); }
 	iterator end() { return vect.end(); }

src/modules/extra/m_geo_maxmind.cpp

@@ -209,6 +209,7 @@ public:
 				iter = geoapi.locations.erase(iter);
 			}
 		}
+		geoapi.locations.shrink_to_fit();
 	}
 
 	void OnChangeRemoteAddress(LocalUser* user) override