software/theia/test: fix a flaky test

This test checks that running `slapos node software` command on theia
shell starts installing software, but this command might get an error
like:

    process started, but another slapos process is aleady running with pid 2656158, exiting

this happened for example with https://erp5js.nexedi.net/#/test_result_module/20240911-ED8B4BF9/60

software/theia/test/test.py

@@ -107,6 +107,10 @@ class TheiaTestCase(SlapOSInstanceTestCase):
 
 
 class TestTheia(TheiaTestCase):
+  @classmethod
+  def getInstanceParameterDict(cls):
+    return {"autorun": "user-controlled"} # we interact with slapos in this test
+
   def setUp(self):
     self.connection_parameters = self.computer_partition.getConnectionParameterDict()