Remove redundant explicit generic arguments

[JensAyton]

@jeppes

[codecov]

Codecov Report

Merging #147 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #147   +/-   ##
=======================================
  Coverage   93.20%   93.20%           
=======================================
  Files          44       44           
  Lines        1295     1295           
=======================================
  Hits         1207     1207           
  Misses         88       88           

Flag	Coverage Δ
#ios	93.20% <100.00%> (ø)
#macspm	93.14% <100.00%> (?)

Impacted Files	Coverage Δ
...nectableConvenienceClasses/ActionConnectable.swift	100.00% <100.00%> (ø)
...nvenienceClasses/BlockingFunctionConnectable.swift	100.00% <100.00%> (ø)
...ctableConvenienceClasses/ConsumerConnectable.swift	100.00% <100.00%> (ø)
...usCore/Source/EffectHandlers/EffectRouterDSL.swift	100.00% <100.00%> (ø)
...rce/EventSources/CompositeEventSourceBuilder.swift	100.00% <100.00%> (ø)
MobiusExtras/Source/ConnectableContramap.swift	100.00% <100.00%> (ø)

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