[mlir][bazel] remove tab blank in OpenAccTransforms

Author: yijia1212

utils/bazel/llvm-project-overlay/mlir/BUILD.bazel

@@ -10452,7 +10452,7 @@ cc_library(
         ":OpenACCPassIncGen",
         ":Pass",
         ":TransformUtils",
-        "//llvm:Support",	
+        "//llvm:Support",
     ],
 )