fix(pallet-grants): prevent a transaction failure

[aliXsed]

prevent a transaction failure when cancel_all_vesting_schedules was not limited to the free balance

[rajesh-nodle]

LGTM

[rajesh-nodle]

LGTM

[codecov]

Codecov Report

Merging #624 (b8aefd4) into master (026bd9b) will decrease coverage by 0.01%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master     #624      +/-   ##
==========================================
- Coverage   89.38%   89.37%   -0.02%     
==========================================
  Files          40       40              
  Lines        6295     6294       -1     
==========================================
- Hits         5627     5625       -2     
- Misses        668      669       +1     

Impacted Files	Coverage Δ
pallets/grants/src/lib.rs	64.28% <66.66%> (-1.38%)	⬇️
pallets/grants/src/benchmarking.rs	100.00% <100.00%> (ø)
pallets/grants/src/tests.rs	100.00% <100.00%> (ø)

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