NED: String has to remain raw

[bsipocz]

To close #2227

[codecov]

Codecov Report

Merging #2230 (1c8f8a1) into main (6cd5622) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2230   +/-   ##
=======================================
  Coverage   61.90%   61.90%           
=======================================
  Files         129      129           
  Lines       16310    16310           
=======================================
  Hits        10097    10097           
  Misses       6213     6213           

Impacted Files	Coverage Δ
astroquery/ipac/ned/core.py	88.83% <ø> (ø)

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