[wallet/symbol/mobile] fix: add copy button to private key dialog on AccountDetails screen

[OlegMakarenko]

Problem:

• Not possible to copy private key from the Account Details screen.

Solution:

• Added copy button to the private key dialog box.

Resolved: #2449

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.36%. Comparing base (f26cf7f) to head (70b34e2).
⚠️ Report is 3 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2448      +/-   ##
==========================================
- Coverage   95.59%   95.36%   -0.23%     
==========================================
  Files         716      679      -37     
  Lines       53377    50608    -2769     
  Branches     1403     1404       +1     
==========================================
- Hits        51027    48264    -2763     
+ Misses       2291     2286       -5     
+ Partials       59       58       -1     

Flag	Coverage Δ
explorer-puller	?
explorer-rest	?
wallet-mobile-symbol	94.17% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...mbol/mobile/src/screens/account/AccountDetails.jsx	96.62% <100.00%> (+0.69%)	⬆️

... and 37 files with indirect coverage changes

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[Wayonb]

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