Fixed comment handling in GCODE lines, escapes are no longer stripped

A good example while late night commits can sometimes be a bad idea.

src/octoprint/util/comm.py

@@ -1846,7 +1846,7 @@ def strip_comment(line):
 	for c in line:
 		if c == ";" and not escaped:
 			break
-		result += c if c != "\\" or escaped else ""
+		result += c
 		escaped = (c == "\\") and not escaped
 	return "".join(result)
 

tests/util/test_comm_helpers.py

@@ -15,9 +15,9 @@ class TestCommHelpers(unittest.TestCase):
 	@data(
 		("M117 Test", "M117 Test"),
 		("M117 Test ; foo", "M117 Test "),
-		("M117 Test \\; foo", "M117 Test ; foo"),
-		("M117 Test \\\\; foo", "M117 Test \\"),
-		("M117 Test \\\\\\; foo", "M117 Test \\; foo"),
+		("M117 Test \\; foo", "M117 Test \\; foo"),
+		("M117 Test \\\\; foo", "M117 Test \\\\"),
+		("M117 Test \\\\\\; foo", "M117 Test \\\\\\; foo"),
 		("; foo", "")
 	)
 	@unpack