[2.x] fix: sbt.bat fails to start client/server mode on Windows (#9520)

sbt.bat fails to start in client/server mode on Windows, falling back to running the full JVM in the foreground.

sbtn uses CreateProcess to spawn the server process. The original %%20 path encoding doesn't work in batch delayed expansion context, and the default install path C:\Program Files (x86) contains spaces that CreateProcess splits at.

launcher-package/src/universal/bin/sbt.bat

@@ -51,7 +51,7 @@ set sbt_args_allow_empty=
 set sbt_args_sbt_dir=
 set sbt_args_sbt_version=
 set sbt_args_mem=
-set sbt_args_client=
+set sbt_args_client=-1
 set sbt_args_jvm_client=
 set sbt_args_no_server=
 set sbt_args_experimental_execution_log=
@@ -201,6 +201,14 @@ if defined _client_arg (
   goto args_loop
 )
 
+if "%~0" == "--server" set _server_arg=true
+
+if defined _server_arg (
+  set _server_arg=
+  set sbt_args_client=0
+  goto args_loop
+)
+
 if "%~0" == "--jvm-client" set _jvm_client_arg=true
 
 if defined _jvm_client_arg (
@@ -800,7 +808,7 @@ if defined sbt_args_verbose (
   set "SBT_ARGS=-v !SBT_ARGS!"
 )
 
-set "SBT_SCRIPT=!SBT_BIN_DIR: =%%20!sbt.bat"
+for %%I in ("!SBT_BIN_DIR!sbt.bat") do set "SBT_SCRIPT=%%~sI"
 set "SBT_ARGS=--sbt-script=!SBT_SCRIPT! %SBT_ARGS%"
 
 rem Microsoft Visual C++ 2010 SP1 Redistributable Package (x64) is required