Remove invalid properties from map on property load

In order to not have config file flooded with invalid and corrupted
properties in case of file corruption, remove all these invalid
properties from property map on configuration load.

Signed-off-by: Tomas Slusny <slusnucky@gmail.com>

runelite-client/src/main/java/net/runelite/client/config/ConfigManager.java

@@ -199,6 +199,7 @@ public class ConfigManager
 				if (split.length != 2)
 				{
 					log.debug("Properties key malformed!: {}", groupAndKey);
+					properties.remove(groupAndKey);
 					return;
 				}