fix(loader): wrong shell symbol in spark script

[JackyYangPassion]

fix spark loader sh error

[codecov]

Codecov Report

Merging #402 (255afff) into master (f11d2ae) will increase coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #402      +/-   ##
============================================
+ Coverage     62.55%   62.58%   +0.03%     
+ Complexity     1866      894     -972     
============================================
  Files           260       91     -169     
  Lines          9405     4383    -5022     
  Branches        872      515     -357     
============================================
- Hits           5883     2743    -3140     
+ Misses         3140     1437    -1703     
+ Partials        382      203     -179     

Impacted Files	Coverage Δ
...g/apache/hugegraph/structure/auth/LoginResult.java
...va/org/apache/hugegraph/api/job/GremlinJobAPI.java
...pache/hugegraph/api/traverser/NeighborRankAPI.java
...n/java/org/apache/hugegraph/structure/Element.java
...apache/hugegraph/structure/constant/Traverser.java
...g/apache/hugegraph/structure/schema/EdgeLabel.java
...n/java/org/apache/hugegraph/api/auth/TokenAPI.java
...egraph/structure/traverser/FusiformSimilarity.java
...org/apache/hugegraph/structure/gremlin/Result.java
...va/org/apache/hugegraph/version/ClientVersion.java
... and 159 more

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[imbajin]

thanks，how could we find these bugs~