d/tests: Don't fail version check

We fail if querying the version fails but don't care about
the version comparison since we're packaging a git snapshot.

debian/tests/control

@@ -2,4 +2,4 @@ Tests: version
 Depends:
  geary,
 Restrictions:
- superficial,
+ superficial, allow-stderr,

debian/tests/version

 #!/bin/bash
+
+set -e
+
 verstring="$(LC_ALL=C geary --version)"
 instvers="$(dpkg-query -f '${Version}' --show geary | cut -f1 -d-)"
 expected="geary: $instvers"
 if [ "$verstring" != "$expected" ]; then
     printf >&2  "Expected: %s\n     Got: %s\n" "$expected" "$verstring"
-    exit 1
+    exit 0
 fi