Fixed Height Bug

[0xsharma]

https://linear.app/matic/issue/POS-250/heimdall-height-bug

https://heimdall.api.matic.network/checkpoints/latest

and

https://heimdall.api.matic.network/checkpoints/](https://heimdall.api.matic.network/checkpoints/{ID}

They show heimdall block height = 0

We need to show height correctly as shown here :

https://heimdall.api.matic.network/checkpoints/count

[linear]

POS-250 Heimdall Height Bug

https://heimdall.api.matic.network/checkpoints/latest

and

https://heimdall.api.matic.network/checkpoints/

They show heimdall block height = 0

We need to show height correctly as shown here :

https://heimdall.api.matic.network/checkpoints/count

[codecov-commenter]

Codecov Report

Merging #799 (356928e) into master (3cdebf1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #799   +/-   ##
=======================================
  Coverage   72.73%   72.73%           
=======================================
  Files          49       49           
  Lines        3517     3517           
=======================================
  Hits         2558     2558           
  Misses        730      730           
  Partials      229      229           

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