[lldb-dap] attempt to fix test_disassemble

Author: eronnen

lldb/test/API/tools/lldb-dap/disassemble/TestDAP_disassemble.py

@@ -20,6 +20,7 @@ def test_disassemble(self):
         program = self.getBuildArtifact("a.out")
         self.build_and_launch(program)
         source = "main.c"
+        self.source_path = os.path.join(os.getcwd(), source)
         self.set_source_breakpoints(source, [line_number(source, "// breakpoint 1")])
         self.continue_to_next_stop()