Increase max nft string length

[simonsso]

If the space allowed for a few more bytes IPFS:// urls could for instance be used.

[codecov]

Codecov Report

Merging #715 (829dcaf) into master (5121804) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #715   +/-   ##
=======================================
  Coverage   78.18%   78.18%           
=======================================
  Files          43       43           
  Lines        7596     7596           
=======================================
  Hits         5939     5939           
  Misses       1657     1657           

Impacted Files	Coverage Δ
runtimes/eden/src/pallets_util.rs	0.00% <ø> (ø)

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[aliXsed]

@simonsso I noticed for system parachains such as statemint they have gone all the way to "128" for this limit. So if it will be better future proof to go for 128 it would be still approved from my side.

[simonsso]

@simonsso I noticed for system parachains such as statemint they have gone all the way to "128" for this limit. So if it will be better future proof to go for 128 it would be still approved from my side.

Let's do that.