Renaming the dynamic pathfinding icons to be better represent pathfinding disabled.

indra/newview/lllocationinputctrl.cpp

indra/newview/lllocationinputctrl.h

...iew/skins/default/textures/icons/Pathfinding_Disabled.png

indra/newview/skins/default/textures/textures.xml

indra/newview/skins/default/xui/en/notifications.xml

indra/newview/skins/default/xui/en/strings.xml

...a/newview/skins/default/xui/en/widgets/location_input.xml