refactor: clarify variable name

[0xwitty]

Description

Fix addresses a potential source of confusion in the code where the variable cmd was being reused as a local variable, despite already being defined as an imported package:

cmd "github.com/tendermint/tendermint/cmd/cometbft/commands"

By redefining cmd in the local scope, it could create ambiguity and make the code harder to maintain. To resolve this, the local variable has been renamed to baseCmd, improving clarity and avoiding any potential issues.

Changes:

Before:

cmd := cli.PrepareBaseCmd(rootCmd, "CMT", os.ExpandEnv(filepath.Join("$HOME", cfg.DefaultTendermintDir)))
if err := cmd.Execute(); err != nil {
	panic(err)
}

After:

baseCmd := cli.PrepareBaseCmd(rootCmd, "CMT", os.ExpandEnv(filepath.Join("$HOME", cfg.DefaultTendermintDir)))
if err := baseCmd.Execute(); err != nil {
	panic(err)
}

This adjustment ensures that the code is more readable and less error-prone while maintaining its intended functionality.

PR checklist

• Tests written/updated
• Changelog entry added in .changelog (we use
  unclog to manage our changelog)
• Updated relevant documentation (docs/ or spec/) and code comments

[rootulp]

this fails lint