"Use as global default on my system" never works -- only ever from home dir

There are several issues related to this matter:

• https://github.com/1Password/shell-plugins/issues/416
• https://github.com/1Password/shell-plugins/issues/407
• https://github.com/1Password/shell-plugins/issues/429

The 1Password team has not responded to these issues, which is frustrating. This issue is particularly annoying because I sometimes clone files to /tmp, where the .op configuration directory created by “Use automatically when in this directory or subdirectories” in op plugin init gh cannot be persisted.

After profiling the op CLI, I found that searchDefaultsFilelnCurrentDirRecursively attempts to traverse the parent directories and open files to locate the .op/plugins/<plugin>.json file before falling back to the global configuration. However, this process can be slow due to the complexity of the parent directory structure.

As the description of this function, "Use automatically when in this directory or subdirectories," clearly indicates, there is no need to traverse the entire directory tree of the parent, I propose simplifying the searchDefaultsFilelnCurrentDirRecursively function, which would take O(n) time, where n is the depth of the current directory relative to the root. I do not know the signature of the original function, so this function may need to be rewritten to match the exact behavior. Unit tests should be added to this code, but I have tested it with some hanging cases in my directory. I hope this helps!

```go
package main

import (
"errors"
"os"
"path/filepath"
"strings"
)

func searchDefaultsFilelnCurrentDirRecursively(dir string, program string) ([]byte, error) {
dirToCheck := filepath.Clean(dir)
configFile := filepath.Join(".op", "plugins", program+".json")

for len(dirToCheck) > 0 {
    configFilePath := filepath.Join(dirToCheck, configFile)

    content, err := os.ReadFile(configFilePath)
    if err == nil {
        return content, nil
    }

    dirToCheck = dirToCheck[:strings.LastIndexByte(dirToCheck, byte(os.PathSeparator))]
}

content, err := os.ReadFile(filepath.Join("/", configFile))
if err == nil {
    return content, nil
}

return nil, errors.New("no defaults found")

}
```