Fix Exclude to not call MoveNext past end of sequence

[viceroypenguin]

Based on morelinq/MoreLINQ#692, however this PR uses simpler evaluation of the enumeration; benchmarking shows that complex code is not actually faster.

• exclude-bench.txt
• UserQuery-20230122-204407.log.txt

[codecov-commenter]

Codecov Report

Base: 87.19% // Head: 87.19% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (df6d5c2) compared to base (6ce4733).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #145      +/-   ##
==========================================
- Coverage   87.19%   87.19%   -0.01%     
==========================================
  Files         190      190              
  Lines        5124     5122       -2     
  Branches     1190     1189       -1     
==========================================
- Hits         4468     4466       -2     
  Misses        359      359              
  Partials      297      297              

Impacted Files	Coverage Δ
Source/SuperLinq/Exclude.cs	100.00% <100.00%> (ø)

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