ci: Test sqlite crypto store in coverage check

Author: jplatte

tarpaulin.toml

@@ -7,6 +7,9 @@ exclude-files = [
     "**/tests/*",
 ]
 workspace = true
+# sqlite crypto store is not tested otherwise because it's only activated by
+# matrix-sdk-crypto-ffi, which is excluded from testing below
+features = "crypto-store"
 exclude = [
     # bindings
     "matrix-sdk-crypto-ffi",