[GPU] Minor fix to make sdpa_micro re-enable causal attention masking when not in paged attention mode (#31106)
### Details:
- Causal attention masking has been changed to only be set when in paged
attention mode since
https://github.com/openvinotoolkit/openvino/pull/29906 was merged
- Fix to make `sdpa_micro` to re-enable causal attention masking when
not in paged attention mode
#### Reproduction step and snapshot
`./ov_gpu_func_tests
--gtest_filter=*smoke_ScaledAttnDynamic4D_GPU/ScaledAttnLayerGPUTest.CompareWithRefs/netPRC=f16_IS=[?.20.?.64]_[?.20.?.64]_[?.20.?.64]_[?.1.?.?]_TS=\(1.20.1.64\)_\(1.20.1.64\)_\(2.20.1.64\)_\(1.20.2.64\)_\(1.20.10.64\)_\(2.20.2.64\)_\(1.20.2.64\)_\(1.20.10.64\)_\(2.20.2.64\)_\(1.1.1.2\)_\(1.1.1.10\)_\(2.1.1.2\)_is_causal=1_has_attn=1_has_scale=1_is_scale_const=1_with_transpose0_*
--device_suffix=1`
### Tickets:
- *ticket-id*