grpc: remove junk values from backend Versions object

These junk values were placeholders I was using for some very early
on debugging and somehow stopped noticing them. Remove them.

Signed-off-by: John Mulligan <[email protected]>

Author: phlogistonjohn

sambacc/grpc/backend.py

@@ -30,9 +30,9 @@
 
 @dataclasses.dataclass
 class Versions:
-    samba_version: str = "foo"
-    sambacc_version: str = "bar"
-    container_version: str = "baz"
+    samba_version: str = ""
+    sambacc_version: str = ""
+    container_version: str = ""
 
 
 @dataclasses.dataclass