libcamera: Remove extra ':' after '\todo'

The doxygen '\todo' directory doesn't need to be followed by a colon,
yet a few strayed occurrences have made their way in. Fix them.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

src/libcamera/controls.cpp

@@ -908,7 +908,7 @@ ControlList::ControlList(const ControlInfoMap &infoMap,
 void ControlList::merge(const ControlList &source)
 {
 	/**
-	 * \todo: ASSERT that the current and source ControlList are derived
+	 * \todo ASSERT that the current and source ControlList are derived
 	 * from a compatible ControlIdMap, to prevent undefined behaviour due to
 	 * id collisions.
 	 *