Remove the WebImage placeholder maxWidth/maxHeight modifier, this may break some use case like `TabView`. If user want to use placeholder, limit themselves

[dreampiggy]

This close #133

Use .frame(maxWidth: .infinity) will cause the TabView crash. Actually I think this is SwiftUI issue.

But anyway, we don't limit the placeholder frame, if you want, limit yourself using .placeholder { MyView().frame(width: 100) }

[codecov[bot]]

Codecov Report

Merging #178 (d17d44e) into master (e19c35a) will decrease coverage by 0.20%. The diff coverage is 76.92%.

@@            Coverage Diff             @@
##           master     #178      +/-   ##
==========================================
- Coverage   75.00%   74.79%   -0.21%     
==========================================
  Files          11       11              
  Lines         960      968       +8     
==========================================
+ Hits          720      724       +4     
- Misses        240      244       +4     

Flag	Coverage Δ
ios	70.87% <76.92%> (-0.19%)	:arrow_down:
macos	74.25% <76.92%> (-0.23%)	:arrow_down:

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Impacted Files	Coverage Δ
SDWebImageSwiftUI/Classes/ImagePlayer.swift	71.05% <75.00%> (-5.62%)	:arrow_down:
SDWebImageSwiftUI/Classes/WebImage.swift	89.32% <100.00%> (ø)

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