fix(wrapper): trim property keys when parsing maven-wrapper.properties

When an IDE or formatter adds spaces around '=' in
maven-wrapper.properties (e.g., 'distributionUrl = ...'),
the shell parser's IFS='=' split leaves trailing whitespace
in the key, causing case pattern matches to fail with
'cannot read distributionUrl property'.

Apply trim() to keys in all three property-parsing loops
(mvnw: wrapperUrl + wrapperSha256Sum; only-mvnw: distributionUrl +
distributionSha256Sum) to tolerate such formatting.

Fixes #369

Author: armorbreak001

maven-wrapper-distribution/src/resources/mvnw

@@ -110,6 +110,7 @@ scriptName="$(basename "$0")"
 
 # parse distributionUrl and optional distributionSha256Sum, requires .mvn/wrapper/maven-wrapper.properties
 while IFS="=" read -r key value; do
+  key=$(trim "${key-}")
   case "${key-}" in
   distributionUrl) distributionUrl=$(trim "${value-}") ;;
   distributionSha256Sum) distributionSha256Sum=$(trim "${value-}") ;;