Replace harcoded 'mac' build mode with argument when building idea fi…

…le for Intellij

Summary:
Replace harcoded 'mac' build mode with argument when building idea file for Intellij.
Reason: When using Intellij Gateway remotely, I need to run these scripts on my dev machine which is running on linux.

Reviewed By: avalonalex

Differential Revision: D61740687

fbshipit-source-id: 249c465218dd44d02eb12504f15d74bca8a9bed4

thrift/lib/java/script/create-intellij-project

@@ -2,8 +2,10 @@
 
 set -e
 
+MODE_FILES=$1
+
 javafoundations/scripts/create-idea-project \
---mode-files "mac" \
+--mode-files "$MODE_FILES" \
 --project-root=thrift/lib/java \
 //thrift/lib/java/benchmarks:benchmarks \
 //thrift/lib/java/common:common \