Fix PRINT-STRUCTURE.1

Merged Michał Herda requested to merge mherda/ansi-test:print-structure.1 into master
With print escaping turned off, symbols are printed without any package
prefix. The test called READ-FROM-STRING within WITH-STANDARD-IO-SYNTAX,
which caused the resulting symbol to be read and interned within the
CL-USER package. This commit fixes this behaviour (the symbol is interned
in the CL-TEST package).
Edited by Michał Herda

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