Fix incorrectly typed method for _vec_mul_arguments

[DanielVandH]

I noticed that this method is implicitly assuming that the argument is a ::Tuple{Any} but it will actually accept any argument, i.e. the method is _vec_mul_arguments(::Any, ::Any) when it should be _vec_mul_arguments(::Any, ::Tuple{Any}). For example, on master,

julia> LazyArrays._vec_mul_arguments(2, [])
ERROR: BoundsError: attempt to access 0-element Vector{Any} at index [1]
Stacktrace:
 [1] throw_boundserror(A::Vector{Any}, I::Tuple{Int64})
   @ Base .\essentials.jl:14
 [2] getindex
   @ .\essentials.jl:916 [inlined]
 [3] indexed_iterate (repeats 2 times)
   @ .\tuple.jl:160 [inlined]
 [4] _vec_mul_arguments(args::Int64, ::Vector{Any})
   @ LazyArrays C:\Users\djv23\.julia\packages\LazyArrays\zl2b5\src\linalg\mul.jl:240
 [5] top-level scope
   @ REPL[29]:1

I don't have the best test since the bug I encountered with this is buried in some other code (@dlfivefifty it came up when using CircleCoordinate which failed to match the correct method on Line 252 since CircleCoordinate wasn't a number and so it went to this most generic method).

Hopefully nothing downstream is relying on this behaviour somehow

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.65%. Comparing base (bd92dfc) to head (998f942).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #350   +/-   ##
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  Coverage   95.65%   95.65%           
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  Files          17       17           
  Lines        3155     3155           
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  Hits         3018     3018           
  Misses        137      137           

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[dlfivefifty]

Actually seems like a Julia bug ...but thanks