Fix: dont spin eventloop on touchpad

[kareltucek]

Steps to reproduce:

• flash https://github.com/UltimateHackingKeyboard/firmware-uhk80/pull/364/commits/4f34d1c15d182cdd03cb840f4b93c1b9e6527688 onto uhk v 60, (which is the WIP: Stuck keys logging #364 branch before fix).
• connect touchpad module
• observe OUT being shown continuously
• print the status and observe something like:

+8 U
+7 U
+9 U
+8 U
+7 U
+8 U
+7 U
+9 U
+7 U
+7 U
+8 U

Steps to test the fix:

• pull and flash WIP: Stuck keys logging #364 (which has this branch merged in)
• connect touchpad module
• don't touch the touchpad
• observe OUT alternating with keymap name
• print the status buffer, and observe that it is no longer spammed by the above updates

Reported in UltimateHackingKeyboard/firmware#998

[mondalaci]

@kareltucek I'd like to get this tested by @pcooke9. Please reference the firmware builds.

[kareltucek]

Migrated to UltimateHackingKeyboard/firmware#817 .

Also merging because of lack of replies.