fix(ruby): narrow context window for ruby

Attempt at fix #361

Author: renatolond

queries/ruby/context.scm

@@ -1,17 +1,20 @@
 (class
-  (body_statement) @context.end) @context
+  name: (constant) @context.end) @context
 
 (singleton_class
-  (body_statement) @context.end) @context
+  value: (self) @context.end) @context
 
 (module
-  (body_statement) @context.end) @context
+  name: (constant) @context.end) @context
 
 (method
-  (body_statement) @context.end) @context
+  name: (identifier)
+  parameters: (method_parameters) @context.end) @context
 
 (singleton_method
-  (body_statement) @context.end) @context
+  object: (self)
+  name: (identifier)
+  parameters: (method_parameters) @context.end) @context
 
 (if
   (then) @context.end) @context