Run cargo clippy --all-targets --fix

These lints where missed because the problems were inside tests.

Note that "targets" does not refer to OS/architectures.
```
> cargo build --help
...
Target Selection:
      --lib               Build only this package's library
      --bins              Build all binaries
      --bin [<NAME>]      Build only the specified binary
      --examples          Build all examples
      --example [<NAME>]  Build only the specified example
      --tests             Build all test targets
      --test [<NAME>]     Build only the specified test target
      --benches           Build all bench targets
      --bench [<NAME>]    Build only the specified bench target
      --all-targets       Build all targets
```

mullvad-daemon/src/migrations/v7.rs

@@ -80,7 +80,6 @@ pub struct ShadowsocksProxySettings {
 /// - shadowsocks.peer to shadowsocks.endpoint
 /// - socks5_remote.authentication to socks5_remote.auth
 /// - socks5_remote.peer to socks5_remote.endpoint
-///
 pub fn migrate(settings: &mut serde_json::Value) -> Result<()> {
     if !version_matches(settings) {
         return Ok(());
@@ -254,7 +253,6 @@ mod test {
     use crate::migrations::v7::{migrate_api_access_settings, migrate_bridge_settings};
 
     use super::{migrate, version_matches};
-    use serde_json;
 
     pub const V7_SETTINGS: &str = r#"
 {

mullvad-daemon/src/settings/mod.rs

@@ -528,7 +528,7 @@ mod test {
         );
 
         assert!(
-            settings.block_when_disconnected == false,
+            !settings.block_when_disconnected,
             "The daemon should not block the internet if settings are missing"
         );
     }