remove non-existent function calls

`ImGui_ImplOpenGL3_DestroyFontsTexture` and
`ImGui_ImplOpenGL3_CreateFontsTexture` were removed on 04.06.2025

Author: cone-forest

src/render/opengl/gl_engine_glfw.cpp

@@ -169,14 +169,8 @@ void GLEngineGLFW::configureImGui() {
     ImGuiIO& io = ImGui::GetIO();
     io.Fonts->Clear();
 
-    // these are necessary if different fonts are loaded in the callback
-    // (don't totally understand why, allegedly it may change in the future)
-    ImGui_ImplOpenGL3_DestroyFontsTexture();
-
     ImFontAtlas* _unused;
     std::tie(_unused, regularFont, monoFont) = options::prepareImGuiFontsCallback();
-
-    ImGui_ImplOpenGL3_CreateFontsTexture();
   }