fix (solo12 calibration): Don't use banana port for sliderbox

Due to changed behaviour of the slider box detection, this made the
application crash.  Instead of passing a nonsensical value, simply
rely on the default (auto-detection) here.

src/programs/solo12_hardware_calibration.cpp

@@ -60,7 +60,7 @@ int main(int argc, char** argv)
 
     // Initialize the shared content.
     SharedContent shared_content;
-    shared_content.robot.initialize(argv[1], "banana");
+    shared_content.robot.initialize(argv[1]);
     shared_content.sc_mutex.unlock();
     shared_content.print_home_offset = false;