tests: input: api: dedup some test properties

Move some common properties in the common field.

Signed-off-by: Fabio Baltieri <[email protected]>

tests/subsys/input/api/testcase.yaml

@@ -1,16 +1,15 @@
 # SPDX-License-Identifier: Apache-2.0
 
+common:
+  tags:
+    - input
+  integration_platforms:
+    - native_posix
 tests:
   input.api.thread:
-    tags: input
-    integration_platforms:
-      - native_posix
     extra_configs:
       - CONFIG_INPUT_MODE_THREAD=y
       - CONFIG_INPUT_THREAD_STACK_SIZE=1024
   input.api.synchronous:
-    tags: input
-    integration_platforms:
-      - native_posix
     extra_configs:
       - CONFIG_INPUT_MODE_SYNCHRONOUS=y