Fix Gemma OpenVINO tests (#2402)

* Fix Gemma OpenVINO tests

* Do the same for Gemma3

Author: abheesht17

keras_hub/src/models/gemma/gemma_backbone.py

@@ -114,7 +114,6 @@ def __init__(
                 scale=1.0,
                 mode="fan_in",
                 distribution="untruncated_normal",
-                seed=None,
             ),
             dtype=dtype,
             logit_soft_cap=final_logit_soft_cap,

keras_hub/src/models/gemma3/gemma3_backbone.py

@@ -210,7 +210,6 @@ def __init__(
                 scale=1.0,
                 mode="fan_in",
                 distribution="untruncated_normal",
-                seed=None,
             ),
             dtype=dtype,
             logit_soft_cap=final_logit_soft_cap,