Fix: Quotes around $JVM_OPTS fail with multi-args

Quotes around $JVM_OPTS make java fail when multiple JVM-args are provided.

Java sees all arguments as a single argument failing with an error such as:
  Unrecognized VM option 'HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/tmp/server-standalone.hprof'


Sorry for not providing any tests to back up my statement.. :-)
Did manual testing by modifying the script after "gradle installApp".
Failed with surrounding quotes - worked without quotes.