Trivial improvements to RootDetector

[lemnik]

Goal

Slightly improve the RootDetector overhead.

Changeset

• Use any instead of count() > 0 to early exit when checking the system build-props
• Use a volatile boolean instead of AtomicBoolean to check library-load (no CAS operations are used)
• Use a Reader.isNotBlank function instead of Reader.readText().isNotBlank()

Testing

Modified the unit test, and added a new test for the which su check returning a blank (but not empty) string

[bugsnagbot]

Android notifier sizes

Format	Size impact of Bugsnag (kB)	Size impact of Bugsnag when Minified (kB)
APK	1921.31	1696.73
arm64_v8a	680.33	459.15
armeabi_v7a	614.8	393.62
x86	754.04	532.86
x86_64	725.38	504.19

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