BUILD: peers: fix a build warning about an incorrect intiialization

Just got this one :
src/peers.c:528:13: warning: missing braces around initializer [-Wmissing-braces]
src/peers.c:528:13: warning: (near initialization for 'cde.key') [-Wmissing-braces]

Indeed, this struct contains two structs so scalar zero is not a valid
value for the first field. Let's just leave it as an empty struct since
it was the purpose.
1 file changed