bug fix installing pio developer version (issue: #201)

Author: gepd

commands/deviot_developer_pio.py

@@ -1,5 +1,5 @@
 from sublime_plugin import WindowCommand
-from ..libraries.tools import get_setting, save_setting
+from ..libraries.tools import get_sysetting, save_sysetting
 from ..platformio.update import Update
 
 class DeviotDeveloperPio(WindowCommand):
@@ -11,10 +11,10 @@ class DeviotDeveloperPio(WindowCommand):
     """
 
     def run(self):
-        pio_developer = get_setting('pio_developer', False)
-        save_setting('pio_developer', not pio_developer)
+        pio_developer = get_sysetting('pio_developer', False)
+        save_sysetting('pio_developer', not pio_developer)
         Update().developer_async()
 
 
     def is_checked(self):
-        return get_setting('pio_developer', False)
+        return get_sysetting('pio_developer', False)