fix: avoid false positives during Resque detection

[FraDim]

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Issue

When combining Semantic Logger with other gems that use the Resque namespace and the host app does not use the resque gem, Semantic logger causes a failure during the boot up sequence.

Description of changes

The change makes Resque detection more robust in order to avoid a false positive detection and the subsequent failure in the host's app boot up sequence.

This also aligns the detection with other instances of detecting Resque:

https://github.com/reidmorrison/rails_semantic_logger/blob/eadda203513334f850bc0bc809c295d26642649c/lib/rails_semantic_logger/engine.rb#L108

and detecting other forking:

https://github.com/reidmorrison/rails_semantic_logger/blob/eadda203513334f850bc0bc809c295d26642649c/lib/rails_semantic_logger/engine.rb#L245

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