fix(query): properly apply predicate injections

I think these have been broken since the query parser update. Basically
the inner node for the string content was preventing injections because
include-children was not set.

tests/query/injections/query/test-query-injections.scm

@@ -0,0 +1,27 @@
+; vim: ft=query
+; format-ignore
+(((symbol) @constant
+  (#not-lua-match? @constant "^_*[A-Z][A-Z0-9_]*$"))
+;                             ^ @luap
+)
+
+; format-ignore
+(((tag
+  (attributes
+    (attribute
+      (attribute_name) @keyword)))
+  (#match? @keyword "^(:|v-bind|v-|\\@)"))
+;                    ^ @regex
+)
+
+((comment) @injection.language
+  .
+  [
+    (string_expression
+      (string_fragment) @injection.content)
+    (indented_string_expression
+      (string_fragment) @injection.content)
+  ]
+  (#gsub! @injection.language "#%s*([%w%p]+)%s*" "%1")
+  ;                            ^ @luap
+  (#set! injection.combined))