GS/HW: Fix tex is fb log for palette conversion.

Tex is fb setting is done in Texture sampler which resulted
in hw blend being applied before with barriers on.

Tex is fb can use sw blend so this optimizes that with no cost.

Also fixes an issue where hw blend was on with fbfetch.

pcsx2/GS/Renderers/HW/GSRendererHW.cpp

@@ -5938,9 +5938,6 @@ __ri void GSRendererHW::EmulateTextureSampler(const GSTextureCache::Target* rt,
 
 	m_conf.cb_ps.ScaleFactor = GSVector4(scale_factor * (1.0f / 16.0f), 1.0f / scale_factor, scale_rt, 0.0f);
 
-	if ((m_conf.ps.tex_is_fb && rt->m_rt_alpha_scale) || (tex->m_target && tex->m_from_target && tex->m_target_direct && tex->m_from_target->m_rt_alpha_scale))
-		m_conf.ps.rta_source_correction = 1;
-
 	// Warning fetch the texture PSM format rather than the context format. The latter could have been corrected in the texture cache for depth.
 	//const GSLocalMemory::psm_t &psm = GSLocalMemory::m_psm[m_cached_ctx.TEX0.PSM];
 	const GSLocalMemory::psm_t& psm = GSLocalMemory::m_psm[tex->m_TEX0.PSM];
@@ -6647,7 +6644,7 @@ bool GSRendererHW::CanUseTexIsFB(const GSTextureCache::Target* rt, const GSTextu
 		const GSLocalMemory::psm_t& rt_psm = GSLocalMemory::m_psm[rt->m_TEX0.PSM];
 		if (tex_psm.pal > 0 && tex_psm.bpp < rt_psm.bpp)
 		{
-			GL_CACHE("HW: Disabling tex-is-fb due to palette conversion.");
+			GL_CACHE("HW: Enabling tex-is-fb for palette conversion.");
 			return true;
 		}
 
@@ -7132,6 +7129,19 @@ __ri void GSRendererHW::DrawPrims(GSTextureCache::Target* rt, GSTextureCache::Ta
 		new_scale_rt_alpha = rt->m_rt_alpha_scale;
 	}
 
+	GSDevice::RecycledTexture tex_copy;
+	if (tex)
+	{
+		EmulateTextureSampler(rt, ds, tex, tmm, tex_copy);
+	}
+	else
+	{
+		const float scale_factor = rt ? rt->GetScale() : ds->GetScale();
+		m_conf.cb_ps.ScaleFactor = GSVector4(scale_factor * (1.0f / 16.0f), 1.0f / scale_factor, scale_factor, 0.0f);
+
+		m_conf.ps.tfx = 4;
+	}
+
 	// AA1: Set alpha source to coverage 128 when there is no alpha blending.
 	m_conf.ps.fixed_one_a = IsCoverageAlpha();
 
@@ -7155,6 +7165,9 @@ __ri void GSRendererHW::DrawPrims(GSTextureCache::Target* rt, GSTextureCache::Ta
 		}
 	}
 
+	if ((m_conf.ps.tex_is_fb && rt && rt->m_rt_alpha_scale) || (tex && tex->m_from_target && tex->m_target_direct && tex->m_from_target->m_rt_alpha_scale))
+		m_conf.ps.rta_source_correction = 1;
+
 	if (req_src_update && tex->m_texture != rt->m_texture)
 		tex->m_texture = rt->m_texture;
 
@@ -7438,18 +7451,7 @@ __ri void GSRendererHW::DrawPrims(GSTextureCache::Target* rt, GSTextureCache::Ta
 		m_conf.cb_ps.FogColor_AREF = fc.blend32<8>(m_conf.cb_ps.FogColor_AREF);
 	}
 
-	GSDevice::RecycledTexture tex_copy;
-	if (tex)
-	{
-		EmulateTextureSampler(rt, ds, tex, tmm, tex_copy);
-	}
-	else
-	{
-		const float scale_factor = rt ? rt->GetScale() : ds->GetScale();
-		m_conf.cb_ps.ScaleFactor = GSVector4(scale_factor * (1.0f / 16.0f), 1.0f / scale_factor, scale_factor, 0.0f);
 
-		m_conf.ps.tfx = 4;
-	}
 
 	// Update RT scaled alpha flag, nothing's going to read it anymore.
 	if (rt)