Block Storage: Fix volume show with snapshot (#589)

# Description
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```
$ exo compute block-storage show test
┼─────────────────────────┼──────────────────────────────────────┼
│  BLOCK STORAGE VOLUME   │                                      │
┼─────────────────────────┼──────────────────────────────────────┼
│ Block Storage Snapshots │ a24132b7-300f-45b4-8912-f66bbd80231b │
│                         │ 6a3ece44-0932-4bb2-b298-9c5944cbfce8 │
│ Blocksize               │ 4096                                 │
│ Created AT              │ 2024-04-12 15:25:48 +0000 UTC        │
│ ID                      │ a8602290-2df5-4313-9c7f-30d66d8d293f │
│ Instance                │ n/a                                  │
│ Name                    │ test                                 │
│ Size                    │ 10 GiB                               │
│ State                   │ detached                             │
┼─────────────────────────┼──────────────────────────────────────┼
```

## Checklist
(For exoscale contributors)

* [x] Changelog updated (under *Unreleased* block)
* [x] Testing

## Testing

<!--
Describe the tests you did
-->

---------

Signed-off-by: Pierre-Emmanuel Jacquier <[email protected]>

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## Unrelease
+
+- Block Storage: Fix volume show with snapshot #589
+
 ## 1.77.1
 
 ### Features

cmd/blockstorage_show.go

@@ -64,7 +64,11 @@ func (c *blockStorageShowCmd) cmdRun(cmd *cobra.Command, _ []string) error {
 	if err != nil {
 		return err
 	}
-	volume, err := volumes.FindBlockStorageVolume(c.Name)
+	v, err := volumes.FindBlockStorageVolume(c.Name)
+	if err != nil {
+		return err
+	}
+	volume, err := client.GetBlockStorageVolume(ctx, v.ID)
 	if err != nil {
 		return err
 	}