test: remove decimal coercion from queries

[b-admike]

Description

Following the fix in loopback-connector to get nested property definitions in loopbackio/loopback-connector#136 and loopbackio/loopback-connector#138, we need to modify tests calling find/delete to not coerce queries into decimal values. Before there was a limitation where we receive undefined for the property definition for nested properties, but now we can call these functions using string values as intended in the docs.

Checklist

• New tests added or existing tests modified to cover all changes
• Code conforms with the style
  guide

[jannyHou]

👍 Good job to have the nested property support from juggler, LGTM when CI green.

[b-admike]

Thanks for letting me know the expected behaviour @jannyHou 😄

[b-admike]

@slnode test please

[b-admike]

@jannyHou the tests on windows have not been passing for the past 4.5 months (thanks @rmg for the tip), and the changes are minor, so I'd like to ignore them given all other builds are passing (see #485)