Backends: SDLGPU3: fixed missing release of TexSamplerNearest. (#9196)

Amend/fix 8b86c939c7e
diff --git a/backends/imgui_impl_sdlgpu3.cpp b/backends/imgui_impl_sdlgpu3.cpp
index 9019c7d..975fcef 100644
--- a/backends/imgui_impl_sdlgpu3.cpp
+++ b/backends/imgui_impl_sdlgpu3.cpp
@@ -637,6 +637,7 @@
     if (bd->VertexShader)       { SDL_ReleaseGPUShader(v->Device, bd->VertexShader); bd->VertexShader = nullptr; }
     if (bd->FragmentShader)     { SDL_ReleaseGPUShader(v->Device, bd->FragmentShader); bd->FragmentShader = nullptr; }
     if (bd->TexSamplerLinear)   { SDL_ReleaseGPUSampler(v->Device, bd->TexSamplerLinear); bd->TexSamplerLinear = nullptr; }
+    if (bd->TexSamplerNearest)  { SDL_ReleaseGPUSampler(v->Device, bd->TexSamplerNearest); bd->TexSamplerNearest = nullptr; }
     if (bd->Pipeline)           { SDL_ReleaseGPUGraphicsPipeline(v->Device, bd->Pipeline); bd->Pipeline = nullptr; }
 }