Fixed shadow related errors caused by changeing atlas creation code (Partial)

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/LightLoop/ShadowContext.hlsl

 #ifndef LIGHTLOOP_SHADOW_CONTEXT_HLSL
 #define LIGHTLOOP_SHADOW_CONTEXT_HLSL
 
-#define SHADOWCONTEXT_MAX_TEX2DARRAY   4
+#define SHADOWCONTEXT_MAX_TEX2DARRAY   1
-#define SHADOWCONTEXT_MAX_SAMPLER      3
+#define SHADOWCONTEXT_MAX_SAMPLER      0
+#if SHADOWCONTEXT_MAX_TEX2DARRAY == 4
 TEXTURE2D_ARRAY(_ShadowmapExp_VSM_0);
 SAMPLER(sampler_ShadowmapExp_VSM_0);
 
 TEXTURE2D_ARRAY(_ShadowmapExp_VSM_2);
 SAMPLER(sampler_ShadowmapExp_VSM_2);
+#endif
 
 TEXTURE2D_ARRAY(_ShadowmapExp_PCF);
 SAMPLER_CMP(sampler_ShadowmapExp_PCF);
 	ShadowContext sc;
 	sc.shadowDatas     = _ShadowDatasExp;
 	sc.payloads        = _ShadowPayloads;
-    sc.tex2DArray[0]   = _ShadowmapExp_PCF;
-    sc.tex2DArray[1]   = _ShadowmapExp_VSM_0;
+	sc.tex2DArray[0]   = _ShadowmapExp_PCF;
+	sc.compSamplers[0] = sampler_ShadowmapExp_PCF;
+#if SHADOWCONTEXT_MAX_TEX2DARRAY == 4
+	sc.tex2DArray[1]   = _ShadowmapExp_VSM_0;
-    sc.compSamplers[0] = sampler_ShadowmapExp_PCF;
-    sc.samplers[0]	   = sampler_ShadowmapExp_VSM_0;
+#endif
+#if SHADOWCONTEXT_MAX_SAMPLER == 3
+	sc.samplers[0]	   = sampler_ShadowmapExp_VSM_0;
+#endif
-#endif // LIGHTLOOP_SHADOW_CONTEXT_HLSL
+#endif // LIGHTLOOP_SHADOW_CONTEXT_HLSL