Consolidated handling of isUnique parameter for TryGet (fixes #378)

[lord-executor]

This should fix #378.

All of the generic TryGet<T> overloads and one of the three TryGet overloads already set isUnique to true. The other two are the outliers that behave in a way that is inconsistent with the documented/expected behavior of the method.

[codecov-io]

Codecov Report

Merging #380 (66c1cb4) into master (3ff6bda) will decrease coverage by 0.60%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #380      +/-   ##
==========================================
- Coverage   86.67%   86.07%   -0.61%     
==========================================
  Files          92       92              
  Lines        2530     2520      -10     
==========================================
- Hits         2193     2169      -24     
- Misses        281      295      +14     
  Partials       56       56              

Impacted Files	Coverage Δ
src/Ninject/Syntax/ResolutionExtensions.cs	79.16% <100.00%> (ø)
src/Ninject/ReadOnlyKernel.cs	85.78% <0.00%> (-7.65%)	⬇️
...t/Planning/Bindings/BindingConfigurationBuilder.cs	72.83% <0.00%> (-0.47%)	⬇️
...t/Infrastructure/Introspection/FormatExtensions.cs	88.46% <0.00%> (-0.11%)	⬇️
src/Ninject/KernelConfiguration.cs	98.14% <0.00%> (-0.02%)	⬇️
src/Ninject/GlobalKernelRegistration.cs	0.00% <0.00%> (ø)
...nject/Infrastructure/Language/ExtensionsForList.cs	100.00% <0.00%> (ø)
...Infrastructure/Language/ExtensionsForDictionary.cs	100.00% <0.00%> (ø)
src/Ninject/Modules/AssemblyNameRetriever.cs	79.16% <0.00%> (+4.16%)	⬆️

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