fs/match won't find things in root-folder

[eval]

$ docker run -it babashka/babashka bash -c 'touch tmp/testing.txt && bb -e '"'"'(prn (fs/glob "/tmp" "testing.txt"))'"'"''
[#object[sun.nio.fs.UnixPath 0x5013f6b "/tmp/testing.txt"]]
$ docker run -it babashka/babashka bash -c 'touch testing.txt && bb -e '"'"'(prn (fs/glob "." "testing.txt"))'"'"''
[]
# expected: [#object[sun.nio.fs.UnixPath ,,, "/testing.txt"]] because:
$ docker run -it babashka/babashka bash -c 'touch testing.txt && bb -e '"'"'(prn (fs/exists? (fs/path "/testing.txt")))'"'"''
true

Cause seems to be that the base-path is always appended with file-separator, so when base-path is / we end up with pattern //testing.txt instead of /testing.txt:

fs/src/babashka/fs.cljc

Lines 282 to 288 in aa0f8bc

	pattern (str base-path
	;; we need to escape the file separator on Windows
	(when win? "\\")
	file-separator
	(if win?
	(str/replace pattern "/" "\\\\")
	pattern))

[borkdude]

@eval Fix welcome