Kernel: Fix type, dectivate_writes => deactivate_writes

Author: https://github.com/supercomputer7
Commit: 09d09b79b6
Pull-request: https://github.com/SerenityOS/serenity/pull/7258
Issue: https://github.com/SerenityOS/serenity/issues/7241
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/tomuta

Kernel/Graphics/FramebufferDevice.cpp

@@ -60,7 +60,7 @@ KResultOr<Region*> FramebufferDevice::mmap(Process& process, FileDescription&, c
     return result;
 }
 
-void FramebufferDevice::dectivate_writes()
+void FramebufferDevice::deactivate_writes()
 {
     ScopedSpinLock lock(m_activation_lock);
     if (!m_userspace_framebuffer_region)