config: make litd -V report litd's own version

The `-V` flag inherited from lnd printed the integrated lnd version
(`build.Version()`) instead of litd's own version, while litd's own
`--version` flag already reported the correct value via RichVersion().
Consolidate both flags so either one prints litd's version.

Fixes #1091

Signed-off-by: 0xfandom <kashyapshivank01@gmail.com>

config.go

@@ -365,18 +365,14 @@ func loadAndValidateConfig(interceptor signal.Interceptor) (*Config, error) {
 		return nil, fmt.Errorf("error parsing flags: %w", err)
 	}
 
-	// Show the version and exit if the version flag was specified.
+	// Show the version and exit if the version flag was specified. This
+	// applies for both the `--version` and the `-V` flag.
 	appName := filepath.Base(os.Args[0])
 	appName = strings.TrimSuffix(appName, filepath.Ext(appName))
-	if preCfg.ShowVersion {
+	if preCfg.ShowVersion || preCfg.Lnd.ShowVersion {
 		fmt.Println(appName, "version", RichVersion())
 		os.Exit(0)
 	}
-	if preCfg.Lnd.ShowVersion {
-		fmt.Println(appName, "version", build.Version(),
-			"commit="+build.Commit)
-		os.Exit(0)
-	}
 
 	// The logging config we use to initialise the sub-logger manager below
 	// depends on whether we're running in remote mode or not.

docs/release-notes/release-notes-0.17.0.md

@@ -35,6 +35,10 @@
 
 ### Technical and Architectural Updates
 
+* [Report litd's own version for `litd
+  -V`](https://github.com/lightninglabs/lightning-terminal/pull/1337): The `-V`
+  flag now prints litd's version instead of the integrated lnd version.
+
 ## RPC Updates
 
 ## Integrated Binary Updates