fix(cli/rm/rm.go): using panic is not user friendly

I manually tested the cli and concluded that it's too easy to
reach the panic caused by runtimex.Try0 over there and it would
expose panics to users too frequently.

Let's just convert those into normal error checks. Here is
what we would previously get:

```
% ./ooniprobe rm
? Are you sure you wish to delete the result #0  [Use arrows to move, type to filter]
  true
> false
panic: Try0: interrupt

[...]
```

So, here I just pressed ^D and got a panic. Ouch!

After the diff, we have this:

```
% ./ooniprobe rm
? Are you sure you wish to delete the result #0 false
   ⨯ failure in main command   error=canceled by user
```

and:

```
% ./ooniprobe rm --all
? Are you sure you wish to delete ALL results false
   ⨯ failure in main command   error=canceled by user
```

It seems much better, isn't it?

Part of the QA for ooni/probe#2722

cmd/ooniprobe/internal/cli/rm/rm.go

@@ -9,7 +9,6 @@ import (
 	"github.com/apex/log"
 	"github.com/ooni/probe-cli/v3/cmd/ooniprobe/internal/cli/root"
 	"github.com/ooni/probe-cli/v3/internal/database"
-	"github.com/ooni/probe-cli/v3/internal/runtimex"
 	"github.com/upper/db/v4"
 )
 
@@ -21,7 +20,9 @@ func deleteAll(d *database.Database, skipInteractive bool) error {
 			Options: []string{"true", "false"},
 			Default: "false",
 		}
-		runtimex.Try0(survey.AskOne(confirm, &answer, nil))
+		if err := survey.AskOne(confirm, &answer, nil); err != nil {
+			return err
+		}
 		if answer == "false" {
 			return errors.New("canceled by user")
 		}
@@ -81,7 +82,9 @@ func init() {
 			Options: []string{"true", "false"},
 			Default: "false",
 		}
-		runtimex.Try0(survey.AskOne(confirm, &answer, nil))
+		if err := survey.AskOne(confirm, &answer, nil); err != nil {
+			return err
+		}
 		if answer == "false" {
 			return errors.New("canceled by user")
 		}