[language-shellscript] Highlight all operators in parameter expansions…

…not just `#`.

packages/language-shellscript/grammars/tree-sitter/highlights.scm

@@ -134,7 +134,15 @@
 (binary_expression ["&&" "||"] @keyword.operator.logical.shell)
 
 (pipeline "|" @keyword.operator.pipe.shell)
-(expansion operator: "#" @keyword.operator.expansion.shell)
+
+; Any expansion operator, including all `#`s and `%`s in the following examples:
+;
+; foo="${bar#*.}"
+; foo="${bar##*.}"
+; foo="${bar%*.}"
+; foo="${bar%%*.}"
+; 
+(expansion operator: _ @keyword.operator.expansion.shell)
 
 
 ; "*" @keyword.operator.glob.shell