revert: bring back initial protocol version

packages/rs-drive-abci/src/config.rs

@@ -233,6 +233,8 @@ struct PlatformConfigIntermediate {
     #[serde(flatten)]
     pub instant_lock: InstantLockConfig,
     pub block_spacing_ms: u64,
+    #[serde(default = "PlatformConfig::default_initial_protocol_version")]
+    pub initial_protocol_version: ProtocolVersion,
     pub db_path: PathBuf,
     #[serde(default)]
     pub rejections_path: Option<PathBuf>,
@@ -622,6 +624,10 @@ impl ExecutionConfig {
 }
 
 impl PlatformConfig {
+    fn default_initial_protocol_version() -> ProtocolVersion {
+        INITIAL_PROTOCOL_VERSION
+    }
+
     fn default_network() -> Network {
         Network::Dash
     }