CAM: snapmaker unit tests fix assertTrue() -> assertEqual()

The test was NOT functioning as required.
assert True does NOT compare the expected line with the generated GCode line.
After fixing this, the expected output was updated so that the unit tests pass.

src/Mod/CAM/CAMTests/TestSnapmakerPost.py

@@ -76,7 +76,7 @@ class TestSnapmakerPost(PathTestUtils.PathTestBase):
 ;Header Start
 ;header_type: cnc
 ;machine: Snapmaker 2 A350(T)
-;Post Processor: Snapmaker_post
+;Post Processor: snapmaker_post
 ;Cam File: boxtest.fcstd
 ;Output Time: \\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}\\.\\d{0,6}
 ;thumbnail: deactivated."""
@@ -117,7 +117,7 @@ M5
             if exp.startswith(";Output Time:"):
                 self.assertTrue(re.match(exp, line) is not None)
             else:
-                self.assertTrue(line, exp)
+                self.assertEqual(exp, line)
 
         # test body without header
         gcode = self.get_gcode([], "--machine=A350 --toolhead=50W --spindle-percent --no-header")