'Edit log' context menu item uses accesskey for 'Add log', should use its own

[Sebastian Hengst]

1. Set a breakpoint on a line.
2. In the right sidebar, right click the breakpoint.
3. From the menu, choose 'Add log'. (Accesskey: l)
4. Enter something for the log point
5. Right click again in the sidebar.
   It again uses the accesskey l.
   There is a dedicated accesskey for it:

   debugger/assets/panel/debugger.properties

   Line 551 in 38f0007

    editor.editLogPoint.accesskey=E 

But the menu items use the ones for adding a log point.

debugger/src/components/Editor/menus/breakpoints.js

Line 91 in be8b570

 accesskey: L10N.getStr("editor.addLogPoint.accesskey"), 

debugger/src/components/SecondaryPanes/Breakpoints/BreakpointsContextMenu.js

Line 226 in be8b570

 accesskey: L10N.getStr("editor.addLogPoint.accesskey"),