Camera & info synchronization check timer wrong seconds value

[nakai-omer]

Hello,

Seems like there is a glitch in the initializing of the timer that checks that camera and camera_info msgs are synced. The error message displayed to the user states 10 seconds, while the timer is ticked every 1 second.

image_common/image_transport/src/camera_subscriber.cpp

Line 88 in a32e834

 "In the last 10s:\n" 

image_common/image_transport/src/camera_subscriber.cpp

Line 136 in a32e834

 std::chrono::seconds(1), 

[nakai-omer]

Don't mind creating a PR for this, just need to know which one is better making the timer every 10 seconds, or changing the warning message