Bug: "Emmet: Go to Matching Pair" doesn't work when the closing tag contains whitespace

Issue Type: <b>Bug</b> Try the following XML: ``` <tag> </tag > ``` "Emmet: Go to Matching Pair" does not work when the cursor is in either the opening or the closing tag. When the extra space is removed, the operation succeeds. **Note:** Whitespace after the tag name is legal. See https://stackoverflow.com/a/3314543/181238 VS Code version: Code 1.60.0 (e7d7e9a9348e6a8cc8c03f877d39cb72e5dfb1ff, 2021-09-01T10:43:02.136Z) OS version: Linux x64 5.4.0-81-generic Restricted Mode: No Fetching remote diagnostics for 'SSH: ttdlxapp-tge21' failed: Canceled <details> <summary>System Info</summary> |Item|Value| |---|---| |CPUs|Intel(R) Core(TM) i7-10610U CPU @ 1.80GHz (2 x 2303)| |GPU Status|2d_canvas: unavailable_software<br>gpu_compositing: disabled_software<br>multiple_raster_threads: disabled_off<br>oop_rasterization: disabled_off<br>opengl: disabled_off<br>rasterization: disabled_software<br>skia_renderer: enabled_on<br>video_decode: disabled_software<br>vulkan: disabled_off<br>webgl: unavailable_software<br>webgl2: unavailable_software| |Load (avg)|0, 0, 0| |Memory (System)|7.78GB (0.61GB free)| |Process Argv|--crash-reporter-id 42997b2d-0a94-4c8d-943a-4cf28513cc90| |Screen Reader|no| |VM|100%| |DESKTOP_SESSION|xubuntu| |XDG_CURRENT_DESKTOP|XFCE| |XDG_SESSION_DESKTOP|xubuntu| |XDG_SESSION_TYPE|x11| </details><details><summary>Extensions (22)</summary> Extension|Author (truncated)|Version ---|---|--- Bookmarks|ale|13.2.1 gitlens|eam|11.6.0 better-cpp-syntax|jef|1.15.6 vscode-docker|ms-|1.16.1 python|ms-|2021.9.1218897484 vscode-pylance|ms-|2021.9.1 jupyter|ms-|2021.8.2041215044 jupyter-keymap|ms-|1.0.0 remote-containers|ms-|0.194.0 remote-ssh|ms-|0.65.7 remote-ssh-edit|ms-|0.65.7 cmake-tools|ms-|1.8.1 cpptools|ms-|1.6.0 cpptools-extension-pack|ms-|1.0.0 text-power-tools|qcz|1.29.0 java|red|0.81.0 vscode-commons|red|0.0.6 vscode-xml|red|0.18.0 vc6-keybindings|sam|0.2.0 cmake|twx|0.0.17 vscodeintellicode|Vis|1.2.14 vscode-java-debug|vsc|0.35.0 (1 theme extensions excluded) …