Remove executable permission from svg files (#16)

diff --git a/src/main/resources/icons/language/java/java.svg b/src/main/resources/icons/language/java/java.svg
old mode 100755
new mode 100644
diff --git a/src/main/resources/icons/language/javascript/javascript.svg b/src/main/resources/icons/language/javascript/javascript.svg
old mode 100755
new mode 100644