[mlir:LSP] Remove several more annoying completion commit characters

These characters are annoying in that they accept completions
that weren't intended, causing user frustration.

mlir/lib/Tools/mlir-lsp-server/LSPServer.cpp

@@ -100,7 +100,13 @@ void LSPServer::onInitialize(const InitializeParams &params,
       {"completionProvider",
        llvm::json::Object{
            {"allCommitCharacters",
-            {"\t", ";", ",", "+", "-", "/", "*", "&", "?", ".", "=", "|"}},
+            {
+                "\t",
+                ";",
+                ",",
+                ".",
+                "=",
+            }},
            {"resolveProvider", false},
            {"triggerCharacters",
             {".", "%", "^", "!", "#", "(", ",", "<", ":", "[", " ", "\"", "/"}},