fix: fix error when estimate fee without connecting wallet

[Jarsen136]

Thank you for your contribution to the KodaDot NFT gallery.
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PR type

• Bugfix
• Feature
• Refactoring

What's new?

• PR closes Estimation on minting costs doesn't work properly #2530
• <brief_description_of_what_I've_added>

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• My contribution builds clean without any errors or warnings
• I've merged recent default branch -- main and I've no conflicts
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• I've didn't break any original functionality
• I've posted a screenshot of demonstrated change in this PR

Optional

• I've tested it at </rmrk/collection/26902bc2f7c20c546a-1FVG7>
• I've tested PR on mobile and everything seems works
• I found edge cases
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[vikiival]

~

[Jarsen136]

@vikiival Thank a lot for your review. I have modified the code. ❤️

[vikiival]

[yangwao]

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