hedgewars-engine (rust): fix "protocol_version" -> "hedgewars_engine_protocol_version"
That function/symbol was renamed in ef2fc0210362
-- Library for parameters handling
params = {}
function parseParams()
if ScriptParam ~= nil then
for k, v in string.gmatch(ScriptParam, "(%w+)=([^,]+)") do
params[k] = v
end
end
end