universal/bin/sbt: enclose arrays in quotes

Fixes https://github.com/sbt/sbt/issues/5076. Arrays should be enclosed in
quotes, or otherwise elements with spaces will be broken, e.g. `-Dfoobar="foo
bar"` will become `-Dfoobar=foo` and `bar`.

src/universal/bin/sbt

@@ -330,8 +330,8 @@ copyRt() {
       echo Copying runtime jar.
       mkdir -p "$java9_ext"
       execRunner "$java_cmd" \
-        ${sbt_options[@]} \
-        ${java_args[@]} \
+        "${sbt_options[@]}" \
+        "${java_args[@]}" \
         -jar "$rtexport" \
         "${java9_rt}"
     fi
@@ -382,8 +382,8 @@ run() {
     # run sbt
     execRunner "$java_cmd" \
       $(get_gc_opts) \
-      ${java_args[@]} \
-      ${sbt_options[@]} \
+      "${java_args[@]}" \
+      "${sbt_options[@]}" \
       -jar "$sbt_jar" \
       "${sbt_commands[@]}" \
       "${residual_args[@]}"