Explicit type to set BalanceRatioSelector

[3lonco]

I fixed the error to set assigned values of BalanceRatioSelector using this package.

The same error was reported before. https://github.com/ros-drivers/flir_camera_driver/issues/30 This issue was temporally solved by setting Continuous or Once, but BalanceRatioSelector can not set the assigned values.

◆Before When this line calls "set property",

https://github.com/ros-drivers/flir_camera_driver/blob/a79c509c6580ffed9ec61d7b4f514b4dc4283a95/spinnaker_camera_driver/src/camera.cpp#L153

it is supposed to call the following code. https://github.com/ros-drivers/flir_camera_driver/blob/a79c509c6580ffed9ec61d7b4f514b4dc4283a95/spinnaker_camera_driver/include/spinnaker_camera_driver/set_property.h#L36

However, the result called the following instead of the above. https://github.com/ros-drivers/flir_camera_driver/blob/a79c509c6580ffed9ec61d7b4f514b4dc4283a95/spinnaker_camera_driver/include/spinnaker_camera_driver/set_property.h#L162

◆After To call the setproperty having std::string in the third argument, I specified the type of "Blue" and "Red" as std::string.

◆Cause The reason why the line called setpropety having bool is explained in the following page. https://stackoverflow.com/questions/14770252/string-literal-matches-bool-overload-instead-of-stdstring