fix: donate all vesting token to work with dust delegations

[javiersuweijie]

Description

Dust delegation blocks donation of all vesting tokens. This PR adds a fix to clear the dust so that the donation can go through

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Codecov Report

❗ No coverage uploaded for pull request base (release/v0.46.x@c2d06a0). Click here to learn what that means.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##             release/v0.46.x     #238   +/-   ##
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  Coverage                   ?   65.48%           
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  Lines                      ?    71478           
  Branches                   ?        0           
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  Hits                       ?    46805           
  Misses                     ?    22072           
  Partials                   ?     2601           

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