Fix remove_property

[lshimokawa]

Fixes # When using remove_property as mentioned in the docs:

remove_property(:User, :session_context)

It generates this Cypher, which doesn't work to remove the property

 CYPHER
  MATCH (n:`User`)
  REMOVE n:`session_context`

This pull introduces/changes:

• Fix the spec which has an error that returns a false positive (it is removing :name and it's testing for :title). This causes a failing spec.
• Fix the rename_property to generate the correct Cypher:

 CYPHER
  MATCH (n:`User`)
  REMOVE n.`session_context`

[codecov-io]

Codecov Report

Merging #1559 into master will increase coverage by 0.16%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1559      +/-   ##
==========================================
+ Coverage   93.23%   93.39%   +0.16%     
==========================================
  Files         105      105              
  Lines        4758     4954     +196     
==========================================
+ Hits         4436     4627     +191     
- Misses        322      327       +5

Impacted Files	Coverage Δ
lib/neo4j/migrations/helpers.rb	100% <100%> (ø)	:arrow_up:
lib/neo4j/shared/initialize.rb	89.47% <0%> (-10.53%)	:arrow_down:
lib/neo4j/shared/property.rb	97.77% <0%> (+0.19%)	:arrow_up:
lib/neo4j/active_node/has_n.rb	99.4% <0%> (+0.21%)	:arrow_up:
lib/neo4j/shared/persistence.rb	96.17% <0%> (+0.23%)	:arrow_up:
lib/neo4j/active_rel/persistence.rb	96.8% <0%> (+1.42%)	:arrow_up:

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