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. #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",

flir_camera_driver/spinnaker_camera_driver/src/camera.cpp

Line 153 in a79c509

setProperty(node_map_, "BalanceRatioSelector", "Blue");

it is supposed to call the following code.

flir_camera_driver/spinnaker_camera_driver/include/spinnaker_camera_driver/set_property.h

Line 36 in a79c509

inline bool setProperty(Spinnaker::GenApi::INodeMap* node_map, const std::string& property_name,

However, the result called the following instead of the above.

flir_camera_driver/spinnaker_camera_driver/include/spinnaker_camera_driver/set_property.h

Line 162 in a79c509

inline bool setProperty(Spinnaker::GenApi::INodeMap* node_map, const std::string& property_name, const bool& value)

◆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