Fix pqcheck and pqrepair on Windows (#17210)

A recent change to pqheck, attempted to address an issue where the
pqcheck would not on Windows mahcines when located in a folder containing
a space, such as "C:\program files\elastic\logstash". While this fixed an
issue with spaces in folders, it introduced a new issue related to Java options,
and the pqcheck was still unable to run on Windows.

This PR attempts to address the issue, by removing the quotes around the Java options,
which caused the option parsing to fail, and instead removes the explicit setting of
the classpath - the use of `set CLASSPATH=` in the `:concat` function is sufficient
to set the classpath, and should also fix the spaces issue

Fixes: #17209

Author: robbavey

Diff for: bin/pqcheck.bat

@@ -16,7 +16,7 @@ for %%i in ("%LS_HOME%\logstash-core\lib\jars\*.jar") do (
 	call :concat "%%i"
 )
 
-"%JAVACMD%" "%JAVA_OPTS%" -cp "%CLASSPATH%" org.logstash.ackedqueue.PqCheck %*
+"%JAVACMD%" %JAVA_OPTS% org.logstash.ackedqueue.PqCheck %*
 
 :concat
 IF not defined CLASSPATH (

Diff for: bin/pqrepair.bat

@@ -16,7 +16,7 @@ for %%i in ("%LS_HOME%\logstash-core\lib\jars\*.jar") do (
 	call :concat "%%i"
 )
 
-"%JAVACMD%" %JAVA_OPTS% -cp "%CLASSPATH%" org.logstash.ackedqueue.PqRepair %*
+"%JAVACMD%" %JAVA_OPTS% org.logstash.ackedqueue.PqRepair %*
 
 :concat
 IF not defined CLASSPATH (