fix: makeTrusted/isTrusted has been removed from the master branch

The security framework has been removed from the master branch,
remove the calls to it here and make the testcases pass again.

Resolves:
Object: Exception error: did not understand #isUntrusted
MessageNotUnderstood(Exception)>>signal (ExcHandling.st:254)
Exception class(Object)>>doesNotUnderstand: #isUntrusted (SysExcept.st:1403)
Metaclass>>newMeta:environment:subclassOf:instanceVariableArray:shape:classPool:poolDictionaries:category: (SystemEvents.star#VFS.ZipFile/Installation/Installer.st:56)
CompiledMethod>>valueWithReceiver:withArguments: (CompildMeth.st:408)
optimized [] in UndefinedObject>>executeStatements (SystemEvents.star#VFS.ZipFile/Installation/Installer.st:89)
BlockWrapper>>valueWithReceiver:withArguments: (SystemEvents.star#VFS.ZipFile/Wrapper/BlockWrapper.st:55)
Merge pull request #3 from zecke/master

Fix tests on master