Index of the table Projection starts at 1 not 0

[anshockm]

cycleInputProjection and cycleOutputProjection ran out of the limits of their functions:

[360plugin] 
[360plugin] stack traceback:
[360plugin]     [C]: in function 'format'
[360plugin]     /home/user/.config/mpv/scripts/360plugin.lua:445: in function 'fn'
[360plugin]     mp.defaults:230: in function 'fn'
[360plugin]     mp.defaults:65: in function 'handler'
[360plugin]     mp.defaults:382: in function 'handler'
[360plugin]     mp.defaults:512: in function 'call_event_handlers'
[360plugin]     mp.defaults:554: in function 'dispatch_events'
[360plugin]     mp.defaults:505: in function <mp.defaults:504>
[360plugin]     [C]: ?
[360plugin]     [C]: ?
[360plugin] Lua error: /home/user/.config/mpv/scripts/360plugin.lua:445: bad argument #2 to 'format' (string expected, got nil)

This patch fixed that.