Reflect rename of seexpr to kseexpr

Ref T13762

projects-invent/graphics/kseexpr/metadata.yaml

+description: The embeddable expression engine fork for Krita
+hasrepo: true
+identifier: kseexpr
+name: SeExpr for Krita
+projectpath: kdereview/kseexpr
+repoactive: true
+repopath: graphics/kseexpr

projects-invent/graphics/seexpr/metadata.yaml

-description: Fork of Walt Disney Animation Studios' SeExpr, for Google Summer of Code 2020
-hasrepo: true
-identifier: seexpr
-name: SeExpr for Krita
-projectpath: kdereview/seexpr
-repoactive: true
-repopath: graphics/seexpr