spec_name changed from default

[35359595]

Describe your changes

changed node's spec_name to polkadex-node to fix this issue with plokadot

Issue ticket number and link

Closes #583

Checklist before requesting a review

• I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.
• I removed all Clippy and Formatting Warnings.
• I added required Copyrights.

[codecov]

Codecov Report

Base: 53.52% // Head: 53.52% // No change to project coverage 👍

Coverage data is based on head (aa370e7) compared to base (d33c4fe).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff            @@
##           Develop     #585   +/-   ##
========================================
  Coverage    53.52%   53.52%           
========================================
  Files           20       20           
  Lines         1433     1433           
========================================
  Hits           767      767           
  Misses         666      666           

Impacted Files	Coverage Δ
runtime/src/lib.rs	0.00% <ø> (ø)

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