JSON: Correcting the Sensor Class field

Signed-off-by: Abhishek Malik <abhishek.malik@intel.com>

src/joystick12/joystick12.json

@@ -3,7 +3,7 @@
     "Description": "API for the ElecFreaks* Joystick v 1.2-1.4 Breakout",
     "Sensor Class":
     {
-        "joystick12":
+        "Joystick12":
         {
             "Name": "2-axis Analog Joystick",
             "Description": "This module defines the Joystick API, and implementation for the X and Y buttons could be treated as normal GPIO - this enables easier interrupt support. This driver should be compatible with any 2-axis analog joystick.",
@@ -30,4 +30,4 @@
             }
         }
     }
-}
+}