Rename Symbol SDF shader (#3473)

src/mbgl/gl/renderer_backend.cpp

@@ -144,7 +144,7 @@ void RendererBackend::initShaders(gfx::ShaderRegistry& shaders, const ProgramPar
                   shaders::BuiltIn::LocationIndicatorTexturedShader,
                   shaders::BuiltIn::RasterShader,
                   shaders::BuiltIn::SymbolIconShader,
-                  shaders::BuiltIn::SymbolSDFIconShader,
+                  shaders::BuiltIn::SymbolSDFShader,
                   shaders::BuiltIn::SymbolTextAndIconShader>(shaders, programParameters);
 }