Fix JSON formatting issues.

- Removed trailing commas in Constants
- Removed comments from Startup Cfgs json

Author: jdbrant3

LabJack/LJM/ljm_constants.json

@@ -1068,7 +1068,7 @@
         {
           "device": "T7",
           "fwmin": 1.0331
-        },
+        }
       ],
       "readwrite": "R",
       "default": 0,
@@ -1083,7 +1083,7 @@
         {
           "device": "T7",
           "fwmin": 1.0331
-        },
+        }
       ],
       "readwrite": "W",
       "default": 0,
@@ -1098,7 +1098,7 @@
         {
           "device": "T7",
           "fwmin": 1.0331
-        },
+        }
       ],
       "readwrite": "R",
       "default": 0,

LabJack/LJM/ljm_startup_configs.json

@@ -1,20 +1,3 @@
-// ljm_startup_configs.json:
-//   This is the configurations file that is loaded when LJM is started up.
-//   Distributed with LJM version 1.2100.
-//
-//   Use the string "default" to load the default value for each config
-//   parameter. Otherwise, see the "type" for each config parameter for what
-//   kinds of values can be accepted. Please see LabJackM.h for more information
-//   about what each config parameter does.
-//
-//   Windows file paths must escape \ characters with \. For example, the path
-//       C:\ljm.log
-//   must be escaped as
-//       C:\\ljm.log
-//
-//   Report bugs to support@labjack.com
-//   LabJack's LJM driver/library: https://labjack.com/support/ljm
-
 {
   "LJM_CONFIG_VALUES":
   [