Fix crash dragging images into the animation player (again)

This was fixed by [0] however that fix didn't account for IMB
sometimes freeing GPU resources created by color management
(resolved by [1] which effectively reverted [0]).

Resolve by re-initializing IMB in the case of drag & drop.

[0]: 51467b0611
[1]: 05c56603a9

source/blender/windowmanager/intern/wm_playanim.cc

@@ -2070,7 +2070,7 @@ static char *wm_main_playanim_intern(int argc, const char **argv)
   BLF_exit();
 
   /* NOTE: Must happen before GPU Context destruction as GPU resources are released via
-   * Colour Management module. */
+   * Color Management module. Must be re-initialized in the case of drag & drop. */
   IMB_exit();
 
   if (ps.ghost_data.gpu_context) {
@@ -2086,6 +2086,9 @@ static char *wm_main_playanim_intern(int argc, const char **argv)
 
   /* early exit, IMB and BKE should be exited only in end */
   if (ps.dropped_file[0]) {
+    /* Ensure drag & drop runs with a valid IMB state. */
+    IMB_init();
+
     STRNCPY(filepath, ps.dropped_file);
     return filepath;
   }