Removed two submodules with the wrong path

Submodules should be in [repository]/src not [repository].

Author: gmfricke

.gitmodules

@@ -1,15 +1,9 @@
 [submodule "src/ublox"]
 	path = src/ublox
 	url = https://github.com/KumarRobotics/ublox.git
-[submodule "apriltags_ros"]
-	path = apriltags_ros
-	url = https://github.com/RIVeR-Lab/apriltags_ros.git
 [submodule "src/apriltags_ros"]
 	path = src/apriltags_ros
 	url = https://github.com/RIVeR-Lab/apriltags_ros.git
-[submodule "usb_cam"]
-	path = usb_cam
-	url = https://github.com/bosch-ros-pkg/usb_cam.git
 [submodule "src/usb_cam"]
 	path = src/usb_cam
 	url = https://github.com/bosch-ros-pkg/usb_cam.git