Fix: (-view--format-element) Remove text properties from keywords

Modes like org-indent-mode and org-modern can add text properties to
to-do keywords in Org buffers, and those properties can "bleed over"
when org-element copies those regions into strings.  When those
strings are then displayed in an org-ql-view buffer, they can affect
how the keywords appear, e.g. having extra spaces prefixing them,
which breaks alignment.  We apply faces to the keywords ourselves, so
we don't need any properties from the source buffer.

Fixes #455.

README.org

@@ -555,7 +555,8 @@ Simple links may also be written manually in either sexp or non-sexp form, like:
 
 ** 0.8.8-pre
 
-Nothing new yet.
+*Fixes*
++ Remove text properties from to-do keywords before displaying them in an ~org-ql-view~ buffer.  (Such text properties could cause them to, e.g. display with extra leading spaces, depending on which other modes might be enabled in the source Org buffer.)
 
 ** 0.8.7
 

org-ql-view.el

@@ -872,7 +872,8 @@ return an empty string."
            (title (--> (org-ql-view--add-faces element)
                        (org-element-property :raw-value it)))
            (todo-keyword (-some--> (org-element-property :todo-keyword element)
-                           (org-ql-view--add-todo-face it)))
+                           (org-ql-view--add-todo-face
+                            (substring-no-properties it))))
            (tag-list (if org-use-tag-inheritance
                          ;; MAYBE: Use our own variable instead of `org-use-tag-inheritance'.
                          (if-let ((marker (or (org-element-property :org-hd-marker element)

org-ql.info

@@ -1082,7 +1082,11 @@ File: README.info,  Node: 088-pre,  Next: 087,  Up: Changelog
 5.1 0.8.8-pre
 =============
 
-Nothing new yet.
+*Fixes*
+   • Remove text properties from to-do keywords before displaying them
+     in an ‘org-ql-view’ buffer.  (Such text properties could cause them
+     to, e.g.  display with extra leading spaces, depending on which
+     other modes might be enabled in the source Org buffer.)
 
 
 File: README.info,  Node: 087,  Next: 086,  Prev: 088-pre,  Up: Changelog
@@ -2040,48 +2044,48 @@ Node: Links38925
 Node: Tips39612
 Node: Changelog39936
 Node: 088-pre40872
-Node: 08740984
-Node: 08642216
-Node: 08542450
-Node: 08443106
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-Node: 0271217
-Node: 0175295
-Node: Notes75396
-Node: Comparison with Org Agenda searches75558
-Node: org-sidebar76447
-Node: License76726
+Node: 08741255
+Node: 08642487
+Node: 08542721
+Node: 08443377
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+Node: Comparison with Org Agenda searches75829
+Node: org-sidebar76718
+Node: License76997
 
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