Don't pass useless journal_mode in URI

Since journal_mode is not one of the parameters that SQLite supports in
URIs (see https://www.sqlite.org/uri.html), and SQLite ignores unknown
parameters in URIs, the attempt to set the journal_mode does not
actually do anything.  Remove it to avoid confusion.

Test: adb shell dumpsys android.security.maintenance | grep journal_mode
      # shows "delete" both before and after this change, even with
      # the check of wal_db_journalmode_v3 replaced with 'true'.
Bug: 314419678
Change-Id: Ibf8497195a0e3d954cdec956cb29bf903a91bf5c
diff --git a/keystore2/src/database.rs b/keystore2/src/database.rs
index 626a1c0..34e0c59 100644
--- a/keystore2/src/database.rs
+++ b/keystore2/src/database.rs
@@ -1163,14 +1163,6 @@
         let mut persistent_path_str = "file:".to_owned();
         persistent_path_str.push_str(&persistent_path.to_string_lossy());
 
-        // Connect to database in specific mode
-        let persistent_path_mode = if keystore2_flags::wal_db_journalmode_v3() {
-            "?journal_mode=WAL".to_owned()
-        } else {
-            "?journal_mode=DELETE".to_owned()
-        };
-        persistent_path_str.push_str(&persistent_path_mode);
-
         Ok(persistent_path_str)
     }