Add break for default cases

Visual Studio has an option to search all files in a solution, so I
did a search in there for "default:" looking for any missing break
statements.

I've left out default statements that return something, and that throw
something, even if via ThrowInvalidType. UNREACHABLE leads towards throw

R_THROW macro leads towards a return

src/video_core/renderer_vulkan/vk_scheduler.cpp

@@ -221,6 +221,7 @@ void Scheduler::SubmitExecution(VkSemaphore signal_semaphore, VkSemaphore wait_s
             [[fallthrough]];
         default:
             vk::Check(result);
+            break;
         }
     });
     chunk->MarkSubmit();

src/video_core/renderer_vulkan/vk_texture_cache.cpp

@@ -108,6 +108,7 @@ constexpr VkBorderColor ConvertBorderColor(const std::array<float, 4>& color) {
             break;
         default:
             ASSERT_MSG(false, "Invalid surface type");
+            break;
         }
     }
     if (info.storage) {