don't protect RTT textures vram

Fixes Spikers Battle RTT texture spurious update before use
(transitions)

core/rend/dx11/dx11_renderer.cpp

@@ -1129,7 +1129,7 @@ void DX11Renderer::readRttRenderTarget(u32 texAddress)
 			device->CreateShaderResourceView(texture->texture, &viewDesc, &texture->textureView.get());
 
 			texture->dirty = 0;
-			texture->protectVRam();
+			texture->unprotectVRam();
 		}
 	}
 }

core/rend/dx9/d3d_renderer.cpp

@@ -930,7 +930,7 @@ void D3DRenderer::readRttRenderTarget(u32 texAddress)
 			D3DTexture* texture = texCache.getRTTexture(texAddress, pvrrc.fb_W_CTRL.fb_packmode, w, h);
 			texture->texture = rttTexture;
 			texture->dirty = 0;
-			texture->protectVRam();
+			texture->unprotectVRam();
 		}
 	}
 }

core/rend/gles/gltex.cpp

@@ -332,7 +332,7 @@ void ReadRTTBuffer()
 			texture_data->texID = gl.rtt.tex;
 			gl.rtt.tex = 0;
 			texture_data->dirty = 0;
-			texture_data->protectVRam();
+			texture_data->unprotectVRam();
 		}
 		gl.rtt.texAddress = ~0;
 	}

core/rend/vulkan/drawer.cpp

@@ -527,7 +527,7 @@ void TextureDrawer::EndRenderPass()
 		//memset(&vram[fb_rtt.TexAddr << 3], '\0', size);
 
 		texture->dirty = 0;
-		texture->protectVRam();
+		texture->unprotectVRam();
 	}
 	Drawer::EndRenderPass();
 }

core/rend/vulkan/oit/oit_drawer.cpp

@@ -646,7 +646,7 @@ void OITTextureDrawer::EndFrame()
 		//memset(&vram[fb_rtt.TexAddr << 3], '\0', size);
 
 		texture->dirty = 0;
-		texture->protectVRam();
+		texture->unprotectVRam();
 	}
 	OITDrawer::EndFrame();
 }