Don't emit ENCRYPTION_WARNING for x84_64 in TUI

[prudo1]

With x86 now supporting encrypted dump target commit a6c2cf4 ("Don't emit ENCRYPTION_WARNING for x86_64") removed printing the warning for x86. However it only did it for the GUI not the TUI. Suppress the warning there as well.

Fixes: a6c2cf4 ("Don't emit ENCRYPTION_WARNING for x86_64")

[sourcery-ai]

Hey - I've left some high level feedback:

• Consider reusing the same architecture-checking helper or logic used by the GUI path so that the condition for suppressing ENCRYPTION_WARNING is defined in a single place rather than duplicating the arch string comparison here.
• If possible, avoid hardcoding the string "x86_64" directly in the TUI code and instead reference a shared constant or helper to reduce the chance of subtle mismatches with other architecture checks.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider reusing the same architecture-checking helper or logic used by the GUI path so that the condition for suppressing ENCRYPTION_WARNING is defined in a single place rather than duplicating the arch string comparison here.
- If possible, avoid hardcoding the string "x86_64" directly in the TUI code and instead reference a shared constant or helper to reduce the chance of subtle mismatches with other architecture checks.

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[gemini-code-assist]

Code Review

This pull request updates the kdump TUI spoke to suppress encryption warnings on the x86_64 architecture by modifying the refresh method. A review comment identifies a consistency issue where the status property still returns a warning regardless of architecture, which would cause the main hub to display a warning that disappears upon entering the spoke; it is recommended to apply the architecture check to the status property as well.