imgui_freetype: fix nullptr to ImTextureID cast (#7192)

diff --git a/misc/freetype/imgui_freetype.cpp b/misc/freetype/imgui_freetype.cpp
index dcef17f..a78bd5e 100644
--- a/misc/freetype/imgui_freetype.cpp
+++ b/misc/freetype/imgui_freetype.cpp
@@ -437,7 +437,7 @@
     ImFontAtlasBuildInit(atlas);
 
     // Clear atlas
-    atlas->TexID = (ImTextureID)nullptr;
+    atlas->TexID = 0;
     atlas->TexWidth = atlas->TexHeight = 0;
     atlas->TexUvScale = ImVec2(0.0f, 0.0f);
     atlas->TexUvWhitePixel = ImVec2(0.0f, 0.0f);