[flang] Fix flang (the bash wrapper script for the Flang driver)

Remove erroneous `||` at the end of an `if` condition. This was
introduced in https://reviews.llvm.org/D106871.

Author: banach-space

flang/tools/f18/flang.in

@@ -219,8 +219,7 @@ categorise_opts()
       [[ $opt =~ -I.* ]] ||
       [[ $opt =~ -J.* ]] ||
       [[ $opt == "-fopenmp" ]] ||
-      [[ $opt == "-fopenacc" ]] ||
-      ; then
+      [[ $opt == "-fopenacc" ]]; then
       flang_opts+=($opt)
       fc_opts+=($opt)
     else