fix: typo in args (#527)

Soooo, this was my mistake. I was curious why this wasn't working as expected and it's because we're checking `args` here instead of `arg`. Yay type safety.

Author: ckipp01

semanticdb-javac/src/main/java/com/sourcegraph/semanticdb_javac/SemanticdbJavacOptions.java

@@ -55,7 +55,7 @@ public static SemanticdbJavacOptions parse(String[] args, Context ctx) {
         }
       } else if (arg.startsWith("-sourceroot:")) {
         result.sourceroot = Paths.get(arg.substring("-sourceroot:".length())).normalize();
-      } else if (arg.equals("-build-tool:sbt") || args.equals("-build-tool:mill")) {
+      } else if (arg.equals("-build-tool:sbt") || arg.equals("-build-tool:mill")) {
         result.uriScheme = UriScheme.ZINC;
       } else if (arg.equals("-build-tool:bazel")) {
         result.uriScheme = UriScheme.BAZEL;