Fix string output of Base.format_bytes when binary=false (JuliaLang#52932)

Introduced in [50572](JuliaLang#50572)

Before:
```
julia> Base.format_bytes(1, binary=false)
"1 "

julia> Base.format_bytes(11, binary=false)
"11 s"
```

This PR:
```
julia> Base.format_bytes(1, binary=false)
"1 byte"

julia> Base.format_bytes(11, binary=false)
"11 bytes"
```
Also add tests.

Author: christiangnrd

base/timing.jl

@@ -140,7 +140,7 @@ function format_bytes(bytes; binary=true) # also used by InteractiveUtils
     factor = binary ? 1024 : 1000
     bytes, mb = prettyprint_getunits(bytes, length(units), Int64(factor))
     if mb == 1
-        return string(Int(bytes), " ", units[mb], bytes==1 ? "" : "s")
+        return string(Int(bytes), " ", _mem_units[mb], bytes==1 ? "" : "s")
     else
         return string(Ryu.writefixed(Float64(bytes), 3), binary ? " $(units[mb])" : "$(units[mb])B")
     end

test/misc.jl

@@ -1396,6 +1396,21 @@ end
     @test (@allocations "a" * Base.inferencebarrier("b")) == 1
 end
 
+#TODO: merge with `@testset "Base/timing.jl"` once https://github.com/JuliaLang/julia/issues/52948 is resolved
+@testset "Base/timing.jl2" begin
+    # Test the output of `format_bytes()`
+    inputs = [(factor * (Int64(1000)^e),binary) for binary in (false,true), factor in (1,2), e in 0:6][:]
+    expected_output = ["1 byte", "1 byte", "2 bytes", "2 bytes", "1000 bytes", "1000 bytes", "2.000 kB", "1.953 KiB",
+                        "1000.000 kB", "976.562 KiB", "2.000 MB", "1.907 MiB", "1000.000 MB", "953.674 MiB",
+                        "2.000 GB", "1.863 GiB", "1000.000 GB", "931.323 GiB", "2.000 TB", "1.819 TiB",
+                        "1000.000 TB", "909.495 TiB", "2.000 PB", "1.776 PiB", "1000.000 PB", "888.178 PiB",
+                        "2000.000 PB", "1776.357 PiB"]
+
+    for ((n, binary), expected) in zip(inputs, expected_output)
+        @test Base.format_bytes(n; binary) == expected
+    end
+end
+
 @testset "in_finalizer" begin
     @test !GC.in_finalizer()