Do not set default binary.

The default binary "launcher" is too generic and can get mixed with
other tools. To use this linter user must explicitly set the absolute
path of the launcher path.

ale_linters/java/javalsp.vim

@@ -1,7 +1,7 @@
 " Author: Horacio Sanson <https://github.com/hsanson>
 " Description: Support for the Java language server https://github.com/georgewfraser/vscode-javac
 
-call ale#Set('java_javalsp_executable', 'launcher')
+call ale#Set('java_javalsp_executable', '')
 
 function! ale_linters#java#javalsp#Executable(buffer) abort
     return ale#Var(a:buffer, 'java_javalsp_executable')