README: drop the stray link underscores between badges

The README HTML has some extra link underscore between spaces due to the
extra newline and space between the <a> and <img> tags. Remove it.

(cherry picked from commit eacee3c)

Original-Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>
GitOrigin-RevId: eacee3c
Cr-Build-Id: 8735719366973287825
Cr-Build-Url: https://cr-buildbucket.appspot.com/build/8735719366973287825
Copybot-Job-Name: zephyr-main-copybot-downstream
Change-Id: I7c3faecfe27c1e0c93cf7f944177d2c6b1f21a3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/5893148
Tested-by: ChromeOS Prod (Robot) <chromeos-ci-prod@chromeos-bot.iam.gserviceaccount.com>
Reviewed-by: Fabio Baltieri <fabiobaltieri@google.com>
Tested-by: Fabio Baltieri <fabiobaltieri@google.com>
Commit-Queue: Fabio Baltieri <fabiobaltieri@google.com>

README.rst

@@ -10,15 +10,9 @@
  </p>
  </a>
 
- <a href="https://bestpractices.coreinfrastructure.org/projects/74">
- <img src="https://bestpractices.coreinfrastructure.org/projects/74/badge">
- </a>
- <a href="https://scorecard.dev/viewer/?uri=github.com/zephyrproject-rtos/zephyr">
- <img src="https://api.securityscorecards.dev/projects/github.com/zephyrproject-rtos/zephyr/badge">
- </a>
- <a href="https://github.com/zephyrproject-rtos/zephyr/actions/workflows/twister.yaml?query=branch%3Amain">
- <img src="https://github.com/zephyrproject-rtos/zephyr/actions/workflows/twister.yaml/badge.svg?event=push">
- </a>
+ <a href="https://bestpractices.coreinfrastructure.org/projects/74"><img src="https://bestpractices.coreinfrastructure.org/projects/74/badge"></a>
+ <a href="https://scorecard.dev/viewer/?uri=github.com/zephyrproject-rtos/zephyr"><img src="https://api.securityscorecards.dev/projects/github.com/zephyrproject-rtos/zephyr/badge"></a>
+ <a href="https://github.com/zephyrproject-rtos/zephyr/actions/workflows/twister.yaml?query=branch%3Amain"><img src="https://github.com/zephyrproject-rtos/zephyr/actions/workflows/twister.yaml/badge.svg?event=push"></a>
 
 
 The Zephyr Project is a scalable real-time operating system (RTOS) supporting