Use old message format with getInfo message for compat

ext/src/lib/bridge.ts

@@ -65,7 +65,7 @@ const getInfo = () => new Promise<BridgeInfo>(async (resolve, reject) => {
 
         applicationVersion = await nativeMessaging.sendNativeMessage(
                 applicationName
-              , { subject: "bridge:getInfo"
+              , { subject: "bridge:/getInfo"
                 , data: version });
     } catch (err) {
         logger.error("Bridge connection failed.");

ext/src/messaging.ts

@@ -171,7 +171,13 @@ type AppMessageDefinitions = {
   , "main:receiverSelector/close": {}
   , "main:receiverSelector/stop": ReceiverSelectionStop
 
+    /**
+     * getInfo uses the old :/ form for compat with old bridge
+     * versions.
+     */
   , "bridge:getInfo": string
+  , "bridge:/getInfo": string
+
   , "bridge:initialize": { shouldWatchStatus: boolean }
 
   , "bridge:receiverSelector/open": any