Add extra constraint to not load injection unless the main bundle is in derived data

[zenangst]

Now the bundle won't load unless the application is in derived data.

[codecov-io]

Codecov Report

Merging #52 into master will increase coverage by 0.04%.
The diff coverage is 20%.

@@            Coverage Diff            @@
##           master     #52      +/-   ##
=========================================
+ Coverage   27.45%   27.5%   +0.04%     
=========================================
  Files          16      16              
  Lines         437     440       +3     
=========================================
+ Hits          120     121       +1     
- Misses        317     319       +2

Impacted Files	Coverage Δ
Tests/iOS+tvOS/UIApplicationDelegateTests.swift	0% <0%> (ø)	⬆️
Source/Shared/Injection.swift	27.1% <25%> (+0.17%)	⬆️

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[jasonnam]

This change prevent me from loading bundle on simulator. I am using Xcode 10 and build configuration for running is set to Debug. Could you explain me more in which case the main bundle path contains products/debug in its path?