Fix typos with codespell

Using codespell 1.15.0.

Method:
```
$ cat > ../godot-word-whitelist.txt << EOF
ang
curvelinear
doubleclick
leapyear
lod
merchantibility
nd
numer
ois
ony
que
seeked
synching
te
uint
unselect
webp
EOF

$ codespell -w -q 3 -I ../godot-word-whitelist.txt --skip="./thirdparty,*.po"
$ git diff // undo unwanted changes
```

servers/visual/shader_language.cpp

@@ -616,7 +616,7 @@ ShaderLanguage::Token ShaderLanguage::_get_token() {
 					else
 						tk.type = TK_INT_CONSTANT;
 
-					tk.constant = str.to_double(); //wont work with hex
+					tk.constant = str.to_double(); //won't work with hex
 					tk.line = tk_line;
 
 					return tk;