[terminal] fixed mistake in connection test

The EOM characters were added to the test command string, even tho those are already added by the exchange method. This caused the test to fail with a DNA instrument.

Author: MrClock8163

src/instrumentman/terminal/app.py

@@ -448,11 +448,11 @@ def btn_test_com_pressed(self, event: Button.Pressed) -> None:
             ) as com:
                 match self.query_one("#select_protocol", Select).value:
                     case Protocol.GEOCOM:
-                        ans = com.exchange(r"%R1Q,0:\r\n")
+                        ans = com.exchange(r"%R1Q,0:")
                         if ans != "%R1P,0,0:0":
                             raise Exception("Invalid response.")
                     case Protocol.GSIDNA:
-                        ans = com.exchange(r"a\r\n")
+                        ans = com.exchange(r"a")
                         if ans != "?":
                             raise Exception("Invalid response.")