Fix RichTextLabel alignment for clickable regions

Fixes #41006 (regression from #39164).

The original alignment fix was limited to PROCESS_DRAW mode, which
caused some discrepancies with PROCESS_POINTER mode.
Now only PROCESS_CACHE is excluded with a condition a few lines above.

(cherry picked from commit b783fa1416d5da9d78dec23f1f608b99cbdf5091)

scene/gui/rich_text_label.cpp

@@ -247,7 +247,7 @@ int RichTextLabel::_process_line(ItemFrame *p_frame, const Vector2 &p_ofs, int &
 			lh = line < l.height_caches.size() ? l.height_caches[line] : 1;                                                                                     \
 			line_ascent = line < l.ascent_caches.size() ? l.ascent_caches[line] : 1;                                                                            \
 			line_descent = line < l.descent_caches.size() ? l.descent_caches[line] : 1;                                                                         \
-			if ((p_mode == PROCESS_DRAW) && (align != ALIGN_FILL)) {                                                                                            \
+			if (align != ALIGN_FILL) {                                                                                                                          \
 				if (line < l.offset_caches.size()) {                                                                                                            \
 					wofs = l.offset_caches[line];                                                                                                               \
 				}                                                                                                                                               \