[lldb][test] Disable riscv32 disassembly filter test on Windows

Added by #145793

Failing on our Windows on Arm bot:
#145793

Shebang lines don't work on Windows and we can't pass "python script_name"
to the "fdis set" commadn because of the way arguments are parsed currently.

I can fix that but that needs review, disable the test for now.

Author: DavidSpickett

lldb/test/Shell/Commands/command-disassemble-riscv32-bytes.s

@@ -1,4 +1,6 @@
 # REQUIRES: riscv
+# Unsupported until we fix launching the filter program on Windows.
+# UNSUPPORTED: system-windows
 
 # This test verifies that disassemble -b prints out the correct bytes and
 # format for standard and unknown riscv instructions of various sizes,